A lot of mostly UI-related bugs with the Cata classic pre-release patch.

Would indeed be nice to get a working version for Cata Classic!

Edit: Okay, it seems v4.0.0 is working, it is just marked for Wrath flavor and therefore won't be found on the addon managers. Had to install manually.

Yes, someone kindly provided a fix for the issues a few days ago (#371). Today I also updated all the .toc interface versions so the cataclysm-detection should be working now.