This is an extremely bizarre (definitely impossible) issue: my master password appears to have stopped working on my iPad ONLY.
On my iPad, I enter my master password and it gives me the red shaky "that's not right" thing. I try again, typing VERY SLOWLY to make sure I'm typing the right characters and it gives me the red shaky thing again. I try again and it gives me a password hint (which it says is "DzMz", but I don't recognise as something I would have written anyway).
Now panicking, I try the same master password on my iPhone and...it's fine. I try on my Windows laptop...it's fine. Everywhere is fine, except my iPad.
The only thing I can think that makes the difference is that I've signed up to the iOS public beta program and applied it to my iPad.
1Password Version: Not Provided
Extension Version: Not Provided
OS Version: Not Provided
Sync Type: Not Provided