I've been getting that same error on the last version. I don't recall it happening last time I used it (2 Mame releases ago), so I'm inclined to think it's a server issue vice an app issue. Not that I could troubleshoot for another 3 weeks or so anyway...
The system version error comes up on startup and again when loading a profile.
EDIT: and here's why: Since the homepage is now https, you need to download this update manually. The updater will work again once you have 4.033 installed
Just broke my personal record for number of consecutive days without dying!