Well that’s definately not something I know, since I just started alpha testing yesterday. However, I can say that the only bug I have found is some sort of sessions error, but I’m still not convinced it’s not my computers doing.
I know that doesn’t answer your question, but perhaps it will give you a feel of what’s going on.
Version 1.3 is still in the ALPHA stage, which means a lot can change very quickly, and also, a lot can suddenly be broken in a new nightly.
Using 1.3 on a production site is risky, but if you don’t mind a bit of risk, then jump in with both feet.