Followed the bible of upgrades (Mitchel Sellers guides), and the install completed successfully, but afterwards it's been anything but smooth. I can't log in using IE (logging in just redisplays home page without admin menu, and "login" is still an option). Other times, the site won't even display (compile error message), sometimes it displays but with the ModuleLoadException for all modules, or a "Unhandled error loading module" just to display site settings (Firefox let me log in). Anything I can check?

Hmm, got frustrated with it and left it for today. Today all is well. Only thing I can think of is 3E may have been having some network issues, and perhaps it just took a while for the upgrade to "take". Beats me, but thanks a bunch, and have a great weekend!