@THe Red Queen I thank you for your reply. There is a subreddit for the older divinity games but it won't be very helpful for technical issues, also it is very small and very inactive. I've never visited the Original Sin one, as I'd assumed it mainly focused on D:OS1 onwards. I'm far from getting around to playing those. In any case, I've stopped posting on reddit.
I'd tried again shortly after making this forum post and restarting the laptop and the bug remained. However I loaded it up again just now, and the issues seems to be gone for good probably. I've teleported to the Aleroth base without CTD and there's no graphic glitch. Same for the houses in Ars Magicana, which is where I was when I encountered the issue. While it is gone for now, it is not a done deal and may appear again, in which case I'll make an update here even with the faint hopes that someone would know a fix. But I have a very strong feeling it won't happen again, right till the moment I'm done with the game.
