Permission repair seems to work for me, but didn't fix anything. This is however the least stable, and the least working copy so far for me. Fresh install. Airport doesn't work, force-quit doesn't work, finder restarts randomly. I tried File Vault and it encrypted my files (took around an hour). I then turned it off (took like 1 second) and it erased my entire home directory, which I luckily had backed up.
I'm not complaining, it's obviously a beta, but I was hoping for more stability, and more features working, not less. So far this is the only version released that I can't really use on a daily basis. Oh well.