For kicks I attacked the boneguards on Level 2 of the Officer Tower, and then Morvyn and some of his cronies come out and I had to kill them too. I didn't speak to Morvyn, nor did I venture inside, into the training area.

Anyways, after I returned to that level again, I'm not able to enter into the training area that Morvyn came out from! I simply cannot move beyond the door. Anyone have the same problem?

Yea, on a different spot. Use the teleport cheat to beam your party around, there's no other way.

http://www.sorcerers.net/Games/IWD2/iwd2_cheats.htm