So I'm finally running a more or less stable install (only problem I get is assertion error at line 250 => clearing temp folder of stores while the game is running seems to remedy the issue), and I just cleared Durlag's Tower. Talked to Drizzt (there were two of'm, ctrl-y'd one), and then travelled to Ulgoth's Beard.
However! Upon re-entering Ulgoth's Beard, I noticed that Ike stood there. And that gnome with the unpronounceable name. And that mage whose cloak you've got to go search. All of that sparked my interest. So I travelled to BG again, and Marek and Lothander came up to me again.
Everything seems to have been reset somehow. I've no interest in ctrl-y'ing my way through all those quests again (as otherwise, I'd be even more overpowered than I am now).
Any suggestions?