Just as the topic says. Happened after I opted in for the latest beta patch. Python (I use wrye bash) said something about corruption, and removed it from my esm/esp list. What happened here?

You were using a version of Bash that predated the Beta. It's been fixed. You should be using the latest 296 version available on the Nexus.

If you're using Wrye Bash 295:5 and you have errors saying that Update.esm is corrupt which is normal. http://www.gamesas.com/topic/1376871-rel-wrye-bash/.