Save button doesn't do anything

I can't change my settings, or add an account. When I click save on the settings panel, nothing happens, but if I click cancel, the panel disappears, but settings are obviously not saved.

I also can't set up my account, when I add my username, and click the + button, it clears my username, but doesn't add it to the list of accounts.

I have tried looking for the twhirl folder, but can't find it (no Application Data folder in my PC's user account folder).