0.81 Campaign selection bug?

[Kugutsu]

I hate to be the one to rain on the parade, but I have just fired up 0.81 and I cant seem to start a new campaign.
I have played a custom battle, so the game works, but when I select a campaign and press the arrow in the bottom right corner to start campaign, I get back to the main menu. And I cant seem to break out of this loop...
Is this a known problem, a corrupt installation or what?
I will uninstall and reinstall RTW and EB just in case, but I thought I would flag it up.

And quick battle just sent me CTD...