--- a/src/video/cocoa/wnd_quartz.mm	Fri Apr 18 19:26:52 2008 +0000
+++ b/src/video/cocoa/wnd_quartz.mm	Fri Apr 18 21:21:25 2008 +0000
@@ -175,7 +175,8 @@
 			CMCloseProfile(sysProfile);
 		}
 
-		assert(colorSpace != NULL);
+		if (colorSpace == NULL)
+			error("Could not get system colour space. You might need to recalibrate your monitor.");
 	}
 
 	return colorSpace;