there are a few bugs with image loading on 1.3, and there's a chance that the avatar that's saved with 1.2 has an image that breaks with 1.3 and it crashes.
you can open 1.2, open one of the default .veadomini files on it, close it, and open 1.3. it shouldn't crash after that :0
but yeah your old avatar probably won't work on 1.3 because of those bugs. i'm really sorry for the inconvenience