New version: 1.2.2a-Mustaa. This fixes the crash that Chloe described (basically, the class "GuiTooltiphelp" was renamed to "GuiTooltipHelper"). This requires a newer version of IC2 though (not sure exactly which version, but the newest should work).
Edit: heyo, this is good for the 200th post.
Speaking of posts, you have 1,111 congrats!!
edit: and it's on the 11th page ;P