I just upgraded to 5.5, and everything went really smoothly. Except one thing.
I logged two computers onto the domain (both Win2K boxes) that had previously been capable of logging onto the domain when I was running 5.1.2. I was not using roaming profiles.
Both reported the same error message: //gateway/dave/profiles cannot be copied to /dave/profiles (or somesuch path, can't remember) because resource is invalid (or something like that -- wish I'd written it down!)
Now both desktops are reset to the default windows settings, which is really annoying. Anyone else have this trouble?