Same problem.
I have deleted config file. Opened portable version and after he ask me what pasword i wish to use - it crashed((
The portable version doesn't use the appdata folder, it's everything in the folder from where you started the exe. You have to import you old wallet into the portable version to get access to your bitcoins.
Same thing with the insateller. I have deleted everything. Installed the new version and after he asked me which server i want to use - the program crashed again. Without any error, just crashed.
And when i am trying to open it again - there no screen, no nothing.