I'm running the demo version of beta16, just switched from the demo of beta15b. Anti-aliasing is no longer functioning for me. I initially just installed the new version over my previous version: I've tried restarting and also deleting the entire game and settings for a clean install. When I returned to 15b anti-aliasing worked fine.
its a bug, and pib has said it will be fixed in beta 16 b
Cheers. Guess I'll stick to 15b for now then