diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index fdaeca888..59be09c95 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -120,7 +120,7 @@ jobs:
         if: startsWith(matrix.config.os, 'ubuntu-')
         run: |
           sudo apt-get update
-          sudo apt-get install ninja-build build-essential libx11-dev libwxgtk3.0-gtk3-dev libfreetype6-dev pkg-config libfontconfig1-dev libass-dev libasound2-dev libffms2-dev intltool libboost-all-dev
+          sudo apt-get install ninja-build build-essential libx11-dev libwxgtk3.0-gtk3-dev libfreetype6-dev pkg-config libfontconfig1-dev libass-dev libasound2-dev libffms2-dev intltool libboost-all-dev libhunspell-dev libuchardet-dev libpulse-dev libopenal-dev libjansson-dev
 
       - name: Configure
         run: meson setup build ${{ matrix.config.args }} -Dbuildtype=${{ matrix.config.buildtype }}
@@ -188,7 +188,6 @@ jobs:
 
           ./linuxdeploy --appdir appdir --desktop-file=appdir/aegisub.desktop
           ./appimagetool appdir
-          # ./appimagetool -g -s appdir --comp xz
 
       - name: Upload artifacts - Linux AppImage
         uses: actions/upload-artifact@v3
diff --git a/libaegisub/include/libaegisub/lua/utils.h b/libaegisub/include/libaegisub/lua/utils.h
index c5a65d6e4..cf55e3f4d 100644
--- a/libaegisub/include/libaegisub/lua/utils.h
+++ b/libaegisub/include/libaegisub/lua/utils.h
@@ -129,7 +129,6 @@ struct LuaStackcheck {
 	void dump();
 
 	LuaStackcheck(lua_State *L) : L(L), startstack(lua_gettop(L)) { }
-	~LuaStackcheck() { check_stack(0); }
 };
 #else
 struct LuaStackcheck {
diff --git a/src/auto4_base.cpp b/src/auto4_base.cpp
index 0b9c292bd..ff9615c90 100644
--- a/src/auto4_base.cpp
+++ b/src/auto4_base.cpp
@@ -216,6 +216,7 @@ namespace Automation4 {
 			wxWindow *ww = config_dialog->CreateWindow(&w); // generate actual dialog contents
 			s->Add(ww, 0, wxALL, 5); // add contents to dialog
 			w.SetSizerAndFit(s);
+			w.SetLayoutAdaptationMode(wxDIALOG_ADAPTATION_MODE_ENABLED);
 			w.CenterOnParent();
 			w.ShowModal();
 		});
diff --git a/src/auto4_lua.cpp b/src/auto4_lua.cpp
index a0837fede..8bfe8bf37 100644
--- a/src/auto4_lua.cpp
+++ b/src/auto4_lua.cpp
@@ -677,6 +677,7 @@ namespace {
 		if (lua_isnumber(L, -1) && lua_tointeger(L, -1) == 3) {
 			lua_pop(L, 1); // just to avoid tripping the stackcheck in debug
 			description = "Attempted to load an Automation 3 script as an Automation 4 Lua script. Automation 3 is no longer supported.";
+			stackcheck.check_stack(0);
 			return;
 		}
 
@@ -689,6 +690,7 @@ namespace {
 			name = GetPrettyFilename().string();
 
 		lua_pop(L, 1);
+		stackcheck.check_stack(0);
 		// if we got this far, the script should be ready
 		loaded = true;
 	}
diff --git a/src/auto4_lua.h b/src/auto4_lua.h
index 46068173e..787ce3a6b 100644
--- a/src/auto4_lua.h
+++ b/src/auto4_lua.h
@@ -78,6 +78,8 @@ namespace Automation4 {
 		std::deque<PendingCommit> pending_commits;
 		/// Lines to delete once processing complete successfully
 		std::vector<std::unique_ptr<AssEntry>> lines_to_delete;
+		/// Lines that were allocated here and need to be deleted if the script is cancelled.
+		std::vector<AssEntry *> allocated_lines;
 
 		/// Create copies of all of the lines in the script info section if it
 		/// hasn't already happened. This is done lazily, since it only needs
@@ -118,6 +120,8 @@ namespace Automation4 {
 		/// assumes a Lua representation of AssEntry on the top of the stack, and creates an AssEntry object of it
 		static std::unique_ptr<AssEntry> LuaToAssEntry(lua_State *L, AssFile *ass=nullptr);
 
+		std::unique_ptr<AssEntry> LuaToTrackedAssEntry(lua_State *L);
+
 		/// @brief Signal that the script using this file is now done running
 		/// @param set_undo If there's any uncommitted changes to the file,
 		///                 they will be automatically committed with this
diff --git a/src/auto4_lua_assfile.cpp b/src/auto4_lua_assfile.cpp
index 6caf419aa..ef0bdac6f 100644
--- a/src/auto4_lua_assfile.cpp
+++ b/src/auto4_lua_assfile.cpp
@@ -328,6 +328,12 @@ namespace Automation4 {
 		return result;
 	}
 
+	std::unique_ptr<AssEntry> LuaAssFile::LuaToTrackedAssEntry(lua_State *L) {
+		std::unique_ptr<AssEntry> e = LuaToAssEntry(L, ass);
+		allocated_lines.push_back(e.get());
+		return e;
+	}
+
 	int LuaAssFile::ObjectIndexRead(lua_State *L)
 	{
 		switch (lua_type(L, 2)) {
@@ -453,7 +459,7 @@ namespace Automation4 {
 				// insert
 				CheckBounds(n);
 
-				auto e = LuaToAssEntry(L, ass);
+				auto e = LuaToTrackedAssEntry(L);
 				modification_type |= modification_mask(e.get());
 				QueueLineForDeletion(n - 1);
 				AssignLine(n - 1, std::move(e));
@@ -542,7 +548,7 @@ namespace Automation4 {
 
 		for (int i = 1; i <= n; i++) {
 			lua_pushvalue(L, i);
-			auto e = LuaToAssEntry(L, ass);
+			auto e = LuaToTrackedAssEntry(L);
 			modification_type |= modification_mask(e.get());
 
 			if (lines.empty()) {
@@ -586,7 +592,7 @@ namespace Automation4 {
 		new_entries.reserve(n - 1);
 		for (int i = 2; i <= n; i++) {
 			lua_pushvalue(L, i);
-			auto e = LuaToAssEntry(L, ass);
+			auto e = LuaToTrackedAssEntry(L);
 			modification_type |= modification_mask(e.get());
 			InsertLine(new_entries, i - 2, std::move(e));
 			lua_pop(L, 1);
@@ -625,7 +631,7 @@ namespace Automation4 {
 
 	int LuaAssFile::LuaParseKaraokeData(lua_State *L)
 	{
-		auto e = LuaToAssEntry(L, ass);
+		auto e = LuaToTrackedAssEntry(L);
 		auto dia = check_cast_constptr<AssDialogue>(e.get());
 		argcheck(L, !!dia, 1, "Subtitle line must be a dialogue line");
 
@@ -734,6 +740,7 @@ namespace Automation4 {
 	void LuaAssFile::Cancel()
 	{
 		for (auto& line : lines_to_delete) line.release();
+		for (AssEntry *line : allocated_lines) delete line;
 		references--;
 		if (!references) delete this;
 	}