diff --git a/emscripten.cross b/emscripten.cross
index cbc766d3..f43586b0 100644
--- a/emscripten.cross
+++ b/emscripten.cross
@@ -3,9 +3,17 @@ c = 'emcc'
 cpp = 'em++'
 ar = 'emar'
 strip = 'emstrip'
+cmake = 'emcmake'
+pkg-config = 'empkg-config'
 
 [host_machine]
 system = 'emscripten'
 cpu_family = 'wasm64'
 cpu = 'wasm64'
-endian = 'little'
\ No newline at end of file
+endian = 'little'
+
+[built-in options]
+c_args = ['-pthread']
+cpp_args = ['-pthread']
+c_link_args = ['-pthread']
+cpp_link_args = ['-pthread']
\ No newline at end of file
diff --git a/meson.build b/meson.build
index d6e9b525..496fc178 100644
--- a/meson.build
+++ b/meson.build
@@ -70,7 +70,8 @@ sdl3_opts.add_cmake_defines({
   'SDL_STATIC': 'ON',
   'SDL_SHARED': 'OFF',
   'SDL_TEST': 'OFF',
-  'CMAKE_BUILD_TYPE': 'Release'
+  'CMAKE_BUILD_TYPE': 'Release',
+  'SDL_THREADS': 'ON'
 })
 
 cc = meson.get_compiler('c')
@@ -95,16 +96,20 @@ if host_machine.system() == 'windows'
   deps += cc.find_library('imm32')
   deps += cc.find_library('version')
   deps += cc.find_library('cfgmgr32')
-  sdl3_opts.add_cmake_defines({'HAVE_ISINF': '1'}) # TODO: A hack to get this to compile on MSYS2; otherwise it doesn't link correctly
+  sdl3_opts.add_cmake_defines({'HAVE_ISINF': '1'}) # Hack for MSYS2
   link += '-static'
 endif
 
 if host_machine.system() == 'emscripten'
   link += '-sUSE_WEBGPU'
+  # Use the Emscripten toolchain file when building with cmake subprojects:
+  sdl3_opts.add_cmake_defines({
+    'CMAKE_TOOLCHAIN_FILE': meson.current_source_dir() / 'Emscripten.cmake',
+    'CMAKE_BUILD_TYPE': 'Release'
+  })
 endif
 
 sdl3_proj = cmake.subproject('sdl3', options: sdl3_opts)
-
 deps += sdl3_proj.dependency('SDL3-static')
 
 tracy_opts = ['fibers=true', 'on_demand=true']
@@ -115,44 +120,47 @@ add_project_arguments('-DTRACY_ENABLE', language:['c','cpp'])
 deps += dependency('tracy', static:true, default_options:tracy_opts)
 
 quickjs_opts += 'default_library=static'
-
 deps += dependency('quickjs', static:true, default_options:quickjs_opts)
-
-#deps += dependency('qjs-steam', static:false)
-
-deps += dependency('qjs-layout',static:true)
-deps += dependency('qjs-miniz',static:true)
-
+deps += dependency('qjs-layout', static:true)
+deps += dependency('qjs-miniz', static:true)
 deps += dependency('physfs', static:true)
-
-#deps += dependency('opencv4')
-#deps += cc.find_library('opencv')
-
 deps += dependency('threads')
 deps += dependency('chipmunk', static:true)
 deps += dependency('enet', static:true)
 deps += dependency('soloud', static:true)
+deps += dependency('libqrencode', static:true)
 
-#deps += dependency('qjs-chipmunk', static:false)
-
-deps += dependency('libqrencode', static: true)
-
+link_args = link
 sources = []
-src += ['anim.c', 'config.c', 'datastream.c','font.c','HandmadeMath.c','jsffi.c','model.c','render.c','simplex.c','spline.c', 'transform.c','prosperon.c',  'wildmatch.c', 'sprite.c', 'rtree.c', 'qjs_dmon.c', 'qjs_nota.c', 'qjs_enet.c', 'qjs_soloud.c', 'qjs_qr.c', 'qjs_wota.c', 'monocypher.c', 'qjs_blob.c', 'qjs_crypto.c', 'qjs_time.c']
-
+src += [
+  'anim.c', 'config.c', 'datastream.c','font.c','HandmadeMath.c','jsffi.c','model.c',
+  'render.c','simplex.c','spline.c', 'transform.c','prosperon.c',  'wildmatch.c',
+  'sprite.c', 'rtree.c', 'qjs_dmon.c', 'qjs_nota.c', 'qjs_enet.c', 'qjs_soloud.c',
+  'qjs_qr.c', 'qjs_wota.c', 'monocypher.c', 'qjs_blob.c', 'qjs_crypto.c', 'qjs_time.c'
+]
 # quirc src
-src += ['thirdparty/quirc/quirc.c', 'thirdparty/quirc/decode.c','thirdparty/quirc/identify.c', 'thirdparty/quirc/version_db.c']
+src += [
+  'thirdparty/quirc/quirc.c', 'thirdparty/quirc/decode.c',
+  'thirdparty/quirc/identify.c', 'thirdparty/quirc/version_db.c'
+]
 
-imsrc = ['GraphEditor.cpp','ImCurveEdit.cpp','ImGradient.cpp','imgui_draw.cpp','imgui_tables.cpp','imgui_widgets.cpp','imgui.cpp','ImGuizmo.cpp','imnodes.cpp','implot_items.cpp','implot.cpp', 'imgui_impl_sdlrenderer3.cpp', 'imgui_impl_sdl3.cpp', 'imgui_impl_sdlgpu3.cpp']
+imsrc = [
+  'GraphEditor.cpp','ImCurveEdit.cpp','ImGradient.cpp','imgui_draw.cpp',
+  'imgui_tables.cpp','imgui_widgets.cpp','imgui.cpp','ImGuizmo.cpp','imnodes.cpp',
+  'implot_items.cpp','implot.cpp','imgui_impl_sdlrenderer3.cpp','imgui_impl_sdl3.cpp',
+  'imgui_impl_sdlgpu3.cpp'
+]
 
 srceng = 'source'
 tp = srceng / 'thirdparty'
-
-includes = [srceng,tp / 'cgltf',tp / 'imgui',tp / 'par',tp / 'stb',tp,tp / 'pl_mpeg/include', tp / 'quirc']
+includes = [
+  srceng, tp / 'cgltf', tp / 'imgui', tp / 'par', tp / 'stb',
+  tp, tp / 'pl_mpeg/include', tp / 'quirc'
+]
 
 foreach file : src
-    full_path = join_paths('source', file)
-    sources += files(full_path)
+  full_path = join_paths('source', file)
+  sources += files(full_path)
 endforeach
 
 if get_option('editor')
@@ -173,7 +181,7 @@ foreach folder: zip_folders
   zip_paths += meson.project_source_root() / folder
 endforeach
 
-# Now use the hash file as a dependency so that any change in the files causes a rebuild.
+# Produce core.zip
 core = custom_target('core.zip',
   output : 'core.zip',
   command : ['sh', '-c',
@@ -215,7 +223,7 @@ prosperon = custom_target('prosperon',
 )
 
 prosperon_dep = declare_dependency(
-  link_with:prosperon
+  link_with: prosperon
 )
 
 copy_tests = custom_target(
@@ -244,4 +252,3 @@ tests = [
 foreach file : tests
   test(file, prosperon_raw, args:['tests/' + file + '.js'], depends:copy_tests)
 endforeach
-
diff --git a/scripts/core/engine.js b/scripts/core/engine.js
index 2569c21f..a1b8c868 100644
--- a/scripts/core/engine.js
+++ b/scripts/core/engine.js
@@ -397,8 +397,6 @@ Register.check_registers = function check_registers(obj) {
   }
 }
 
-
-
 Register.add_cb("appupdate")
 Register.add_cb("update").doc = "Called once per frame."
 Register.add_cb("physupdate")
@@ -872,7 +870,14 @@ if (prosperon.args.root) root = json.decode(prosperon.args.root)
 else root = $_
 
 if (overling) actor_prep(overling, {type:'greet', id: prosperon.id})
-if (prosperon.args.program) actor.spawn(prosperon.args.program)
+
+if (!prosperon.args.program)
+  os.exit(1)
+
+if (typeof prosperon.args.program !== 'string')
+  prosperon.args.program = 'main.js';
+  
+actor.spawn(prosperon.args.program)
 
 function destroyself() {
   console.log(`Got the message to destroy self.`)
diff --git a/scripts/modules/cmd.js b/scripts/modules/cmd.js
index b5da893b..f506354c 100644
--- a/scripts/modules/cmd.js
+++ b/scripts/modules/cmd.js
@@ -204,11 +204,19 @@ Cmdline.register_order(
 );
 
 function cmd_args(cmds) {
-  cmds.shift()
-  if (!Cmdline.orders[cmds[0]]) {
-    // assume it's a script
-    cmds.unshift("--program")
-    cmds.unshift("spawn")
+  // Remove the leading 'prosperon'
+  cmds.shift();
+
+  // If there are no arguments left, assume we want to spawn main.js
+  if (!cmds[0]) {
+    // => effectively do: prosperon spawn --program main.js
+    cmds.unshift("main.js");
+    cmds.unshift("--program");
+    cmds.unshift("spawn");
+  } else if (!Cmdline.orders[cmds[0]]) {
+    // If the first token isn't a recognized command, treat it as a script
+    cmds.unshift("--program");
+    cmds.unshift("spawn");
   }
 
   Cmdline.orders[cmds[0]](cmds.slice(1));
diff --git a/scripts/modules/loop.js b/scripts/modules/dull.js
similarity index 69%
rename from scripts/modules/loop.js
rename to scripts/modules/dull.js
index 64c77454..3e84a840 100644
--- a/scripts/modules/loop.js
+++ b/scripts/modules/dull.js
@@ -1,4 +1,9 @@
-// loop.js
+/*
+  the "dull" game engine
+
+  This sets up a lot of different modules to be used altogether
+*/
+
 var render = use('render')   // The refactored file above
 var layout = use('clay')
 var input = use('input')
@@ -7,27 +12,15 @@ var os = use('os')
 var imgui = use('imgui')
 var tracy = use('tracy')
 
-var waittime = 1/240
 var last_frame_time = 0
-var frame_t = 0
-var fpses = []
 var timescale = 1
 
-var dmon = use('dmon')
-
-function dmon_cb(e) { prosperon.dispatch('dmon', e) }
+last_frame_time = os.now()
 
 function step() {
-  if (dmon)
-    dmon.poll(dmon_cb)
-    
   var now = os.now()
   var dt = now - last_frame_time
-  if (dt < waittime) os.sleep(waittime - dt)
-  last_frame_time = os.now()
-
-  dt = last_frame_time - frame_t
-  frame_t = last_frame_time
+  last_frame_time = now
 
 //  event.engine_input(e => prosperon.dispatch(e.type, e))
   layout.newframe()
@@ -35,7 +28,6 @@ function step() {
   prosperon.appupdate(dt)
   input.procdown()
   emitter.update(dt * timescale)
-  os.update_timers(dt * timescale)
   prosperon.update(dt * timescale)
 
   render.setup_draw()
diff --git a/scripts/modules/imgui.js b/scripts/modules/imgui.js
index 3a2318a3..3fd5edc5 100644
--- a/scripts/modules/imgui.js
+++ b/scripts/modules/imgui.js
@@ -56,7 +56,7 @@ if (render_menu) {
       imtoggle("Console [f9]", debug, "console");
     });
 
-    imgui.sokol_gfx();
+//    imgui.sokol_gfx();
 
     imgui.menu("Graphics", _ => {
 //      imtoggle("Draw sprites", render, "draw_sprites");
diff --git a/scripts/modules/resources.js b/scripts/modules/resources.js
index d2614e96..be245223 100644
--- a/scripts/modules/resources.js
+++ b/scripts/modules/resources.js
@@ -42,6 +42,8 @@ function isRecognizedExtension(ext) {
 }
 
 function find_in_path(filename, exts = []) {
+  if (typeof filename !== 'string') return undefined
+  
   if (filename.includes('.')) {
     for (var dir of prosperon.PATH) {
       var candidate = dir + filename
diff --git a/source/prosperon.c b/source/prosperon.c
index 598d76f8..7945a25d 100644
--- a/source/prosperon.c
+++ b/source/prosperon.c
@@ -1327,6 +1327,15 @@ static WotaBuffer event2wota(const SDL_Event *event) {
 
 int main(int argc, char **argv)
 {
+  const char *new_cwd = NULL;
+  for (int i = 1; i < argc; i++) {
+    if (strcmp(argv[i], "--cwd") == 0) {
+      i++;
+      if (i < argc) new_cwd = argv[i];
+      break;
+    }
+  }
+
   SDL_Init(SDL_INIT_EVENTS | SDL_INIT_VIDEO);
   queue_event = SDL_RegisterEvents(1);
 
@@ -1335,6 +1344,7 @@ int main(int argc, char **argv)
     printf("Platform has only one core!\n");
     return 1;
   }
+
   main_thread = SDL_GetCurrentThreadID();
   if (!main_thread) {
     printf("Platform does not support threads!\n");
@@ -1345,7 +1355,11 @@ int main(int argc, char **argv)
   PHYSFS_init(argv[0]);
   const char *base = PHYSFS_getBaseDir();
   PHYSFS_setWriteDir(base);
-  PHYSFS_mount(base, "/", 0);
+  if (new_cwd)
+    PHYSFS_mount(new_cwd, NULL, 0);
+  else
+    PHYSFS_mount(base, NULL, 0);
+    
   int mounted = prosperon_mount_core();
   if (!mounted) mounted = PHYSFS_mount("core.zip", NULL, 0);
   if (!mounted) {
@@ -1358,7 +1372,7 @@ int main(int argc, char **argv)
   actors_mutex = SDL_CreateMutex();
 
   const char *io_script = "scripts/core/io.js";
-  char **io_argv = malloc(sizeof(char*)*2);
+  char **io_argv = malloc(sizeof(char*) * 2);
   io_argv[0] = strdup(argv[0]);
   io_argv[1] = strdup(io_script);
   io_actor = create_actor(2, io_argv);
@@ -1367,15 +1381,15 @@ int main(int argc, char **argv)
   char **margv = malloc(sizeof(char *) * (argc + 2));
   for (int i = 0; i < argc; i++) margv[i] = strdup(argv[i]);
   margv[argc] = "--main";
-  margv[argc+1] = "1";
-  create_actor(argc+2, margv);
+  margv[argc + 1] = "1";
+  create_actor(argc + 2, margv);
 
   /* Start the thread that pumps ready actors, one per logical core. */
   for (int i = 0; i < cores; i++) {
     char threadname[128];
     snprintf(threadname, 128, "actor runner %d", i);
     SDL_Thread *thread = SDL_CreateThread(crank_actor, threadname, NULL);
-    arrput(runners,thread);
+    arrput(runners, thread);
   }
 
   /* Set up signal and exit handlers. */
@@ -1387,11 +1401,10 @@ int main(int argc, char **argv)
 
   SDL_Event event;
   while (SDL_WaitEvent(&event)) {
-    if (event.type == queue_event)
-      goto QUEUE;
+    if (event.type == queue_event) goto QUEUE;
 
-   WotaBuffer wb = event2wota(&event);
-   send_message(io_actor->id, wb.data);
+    WotaBuffer wb = event2wota(&event);
+    send_message(io_actor->id, wb.data);
     continue;
 
     QUEUE:
diff --git a/subprojects/sdl3.wrap b/subprojects/sdl3.wrap
index b8a3116f..0682a417 100644
--- a/subprojects/sdl3.wrap
+++ b/subprojects/sdl3.wrap
@@ -1,4 +1,4 @@
 [wrap-git]
 url = https://github.com/libsdl-org/SDL.git
-revision = release-3.2.4
+revision = release-3.2.10
 depth = 1
diff --git a/tests/window.js b/tests/window.js
index e5a2631d..fc1b9634 100644
--- a/tests/window.js
+++ b/tests/window.js
@@ -1,4 +1,4 @@
-//var draw = use('draw2d')
+var draw = use('draw2d')
 
 prosperon.win = prosperon.engine_start({
   title:`Prosperon [${prosperon.version}-${prosperon.revision}]`,