pwstegman...

I had problems with the gui (win 8.1 / 64bit)
I couldn't open my wallet (it didn't do anything), but in my wallet was no password set.
If I typed a (wrong) password it was doing something (syncing wallet) but in the log it says wrong password.

I made myself a new wallet (with password) and everything worked fine.

hope this helps for my and other guys problems