I'm running pretty smooth... few things:
-100% crash on Alt-tab (direct X error)
-In some cases, hitting the "back" arrow in the docs (hiem..whatever) crashed the system. Might want to have a feature that says IF no object to browse to DO nothing, I was pretty deep in nested browsing at that point, so trying to debug all that might take a while.
-I had a case where it kept saying "must build on open tile" when I was on open tiles. After wasting 6 precious turns wandering around, simply making the Pioneer leave the group made it work right away. I summoned a minor elemental into my army, which wasn't showing (both another bug and possibly connectd with the bug also).
-I'd suggest changing the default to ALWAYS doing manual battle. The Autobattle is beyond terrible, especially because archers do not shoot at all until the enemy is adjacent, which makes then worthless.