diff --git a/source/lib/res/ogl_tex.cpp b/source/lib/res/ogl_tex.cpp
index cbe6026f35..a1e3aa9133 100755
--- a/source/lib/res/ogl_tex.cpp
+++ b/source/lib/res/ogl_tex.cpp
@@ -296,7 +296,7 @@ static int tex_validate(const uint line, const Tex* t)
 		msg = "width or height is 0 - texture probably not loaded successfully";
 	// greater than max supported tex dimension?
 	// no-op if oglInit not yet called
-	if(w > (GLsizei)max_tex_size || h > (GLsizei)max_tex_size)
+	if(w > (GLsizei)ogl_max_tex_size || h > (GLsizei)ogl_max_tex_size)
 		msg = "texture dimensions exceed OpenGL implementation limit";
 	// both NV_texture_rectangle and subtexture require work for the client
 	// (changing tex coords) => we'll just disallow non-power of 2 textures.
diff --git a/source/lib/sysdep/debug.h b/source/lib/sysdep/debug.h
index 2758834dff..08ab75e9dc 100755
--- a/source/lib/sysdep/debug.h
+++ b/source/lib/sysdep/debug.h
@@ -30,45 +30,48 @@
 extern void debug_check_heap(void);
 
 
+// user choices in the assert/unhandled exception dialog.
+enum ErrorReaction
+{
+	// ignore, continue as if nothing happened.
+	ER_CONTINUE = 1,
+		// note: don't start at 0 because that is interpreted as a
+		// DialogBoxParam failure.
+
+	// ignore and do not report again. only works with assert2.
+	ER_SUPPRESS,
+		// note: non-persistent; only applicable during this program run.
+
+	// trigger breakpoint, i.e. enter debugger.
+	ER_BREAK,
+
+	// exit the program immediately.
+	ER_EXIT,
+		// note: never returned; carried out immediately to disburden callers.
+};
+
+
 //////////////////////////////////////////////////////////////////////////////
 //
 // assert
 //
 
-enum FailedAssertUserChoice
-{
-	// ignore, continue as if nothing happened.
-	ASSERT_CONTINUE,
-
-	// ignore and do not report again for this assert.
-	ASSERT_SUPPRESS,
-		// note: non-persistent; only applicable during this program run.
-
-	// trigger breakpoint, i.e. enter debugger.
-	ASSERT_BREAK,
-
-	// exit the program immediately.
-	ASSERT_EXIT
-		// note: carried out by debug_assert_failed;
-		// testing for it in assert2 would bloat code.
-};
-
 // notify the user that an assertion failed; displays a
 // stack trace with local variables.
-// returns one of FailedAssertUserChoice or exits the program.
-extern int debug_assert_failed(const char* source_file, int line, const char* assert_expr);
+// returns one of UserErrorReaction.
+extern ErrorReaction debug_assert_failed(const char* source_file, int line, const char* assert_expr);
 
 // recommended use: assert2(expr && "descriptive string")
 #define assert2(expr)\
 STMT(\
-	static int suppress__ = 0;\
-	if(!suppress__ && !(expr))\
+	static unsigned char suppress__ = 0x55;\
+	if(suppress__ == 0x55 && !(expr))\
 		switch(debug_assert_failed(__FILE__, __LINE__, #expr))\
 		{\
-		case ASSERT_SUPPRESS:\
-			suppress__ = 1;\
+		case ER_SUPPRESS:\
+			suppress__ = 0xaa;\
 			break;\
-		case ASSERT_BREAK:\
+		case ER_BREAK:\
 			debug_break();\
 			break;\
 		}\
diff --git a/source/lib/sysdep/unix/udbg.cpp b/source/lib/sysdep/unix/udbg.cpp
index 572ba46323..ca47d759b7 100755
--- a/source/lib/sysdep/unix/udbg.cpp
+++ b/source/lib/sysdep/unix/udbg.cpp
@@ -105,8 +105,7 @@ static void launch_debugger()
 
 
 // notify the user that an assertion failed.
-// returns one of FailedAssertUserChoice or exits the program.
-int debug_assert_failed(const char *file, int line, const char *expr)
+ErrorReaction debug_assert_failed(const char* file, int line, const char* expr)
 {
 	printf("%s:%d: Assertion `%s' failed.\n", file, line, expr);
 	do
@@ -126,11 +125,11 @@ int debug_assert_failed(const char *file, int line, const char *expr)
 			// fall through
 
 		case 'b':
-			return ASSERT_BREAK;
+			return ER_BREAK;
 		case 'c':
-			return ASSERT_CONTINUE;
+			return ER_CONTINUE;
 		case 's':
-			return ASSERT_SUPPRESS;
+			return ER_SUPPRESS;
 		case 'a':
 			abort();
 		default:
diff --git a/source/lib/sysdep/win/assert_dlg.h b/source/lib/sysdep/win/error_dialog.h
similarity index 96%
rename from source/lib/sysdep/win/assert_dlg.h
rename to source/lib/sysdep/win/error_dialog.h
index f57d105c75..9012bb0947 100755
--- a/source/lib/sysdep/win/assert_dlg.h
+++ b/source/lib/sysdep/win/error_dialog.h
@@ -1,6 +1,6 @@
 //{{NO_DEPENDENCIES}}
 // Microsoft Visual C++ generated include file.
-// Used by assert_dlg.rc
+// Used by error_dialog.rc
 //
 #define IDD_DIALOG1                     101
 #define IDC_EDIT1                       1001
diff --git a/source/lib/sysdep/win/assert_dlg.rc b/source/lib/sysdep/win/error_dialog.rc
similarity index 97%
rename from source/lib/sysdep/win/assert_dlg.rc
rename to source/lib/sysdep/win/error_dialog.rc
index 46d70654ba..b48a09a5ad 100755
--- a/source/lib/sysdep/win/assert_dlg.rc
+++ b/source/lib/sysdep/win/error_dialog.rc
@@ -1,6 +1,6 @@
 // Microsoft Visual C++ generated resource script.
 //
-#include "assert_dlg.h"
+#include "error_dialog.h"
 #include <windows.h>
 
 /////////////////////////////////////////////////////////////////////////////
@@ -20,7 +20,7 @@ LANGUAGE LANG_ENGLISH, SUBLANG_ENGLISH_US
 
 1 TEXTINCLUDE 
 BEGIN
-    "assert_dlg.h\0"
+    "error_dialog.h\0"
 END
 
 2 TEXTINCLUDE