taltamir: @TrollumThinks: There really should be a 4th wall breaking moment where it notifies you to "please take 5, this will take a while" before it starts that processing you described.
Yeah, there should be - I think they mention it in the readme (and we all read the readmes, don't we? LOL )
I'm not sure whether it was possible to add a 'loading' type screen to the process but they could've had some humour with it and had Duke Belt tell you in advance: "You may find yourself suspended in limbo during the unusually long teleport spell for, oh, about 5 minutes. Anybody observing you from the outside would be better off going for a cup of tea." or something.
It's not actually that bad, once you know it's supposed to do that.
As for other bugs/problems - I've never encountered anything serious (even any non-serious bugs don't spring to mind so must be minor if there) and my game is medium-to-heavily modded. Then again, my BG1-side of the mods adds only Unfinished Business, Mini-Quests and Encounters and the BG1 NPC Project.