Beta 3 is freezing with Passwords in 2 situation, well more, but 2 common.
When you are accessing Passwords settings with your vault (password storage) locked and when you try activate One touch login while your vault is locked. We know about that and it is now fixed ready to be released with next beta. If you first unlock the vault and then do such action you should be OK. Note that if this is blocking from further investigation of Avast passwords you may temporarily disable self defense and when you encounter this freeze you may solve it without restarting PC just by killing AvastUI process. I know it is nasty solution, but works