Have you also updated the game after installation to be the latest version? The Golden Wizards became available in a later patch and if that patch has not been installed that would explain the crash. There have been many patches after the initial release of the game.
The game should patch automatically, but the patches are also available here:
http://downloads.cyanide-studio.com/dungeonbowl/It might be that you have to install each patch separately, starting from the smallest version number and going up, even if you let it patch automatically. What I'm trying to say is, letting it patch only once is probably not enough. The current version number displayed on the bottom center of the start-up screen of the game is 1.0.1.2. If you don't see the same version number, you need to patch more. Also, I think it's not enough to just install the latest patch (db-update-11-0-1-2.exe), you need to install ALL of the patches -- and in the correct order. That's my guess, anyway, Ive never needed to completely reinstall the game. Does anyone have actual experience with this?
Also, I have the Steam version, so it probably automaticaly installs the up-to-date version anyway on re-install.