Quote from Mettan
I assume I'm not the first to report the incompatibilities of OptiFine and ModLoader.
It's a real bloody shame, since I want to run Minecraft faster, but I also want all of those cool mods that need ModLoader.
I guess I'll just not use OptiFine 'til it's fixed.
In case anyone is wondering, it's vh.class that is the source of the problem.
When I use the Magic Launcher and set ModLoader to be first in the load order, I do not have problems with the vh.class file.