Hey,
The game crashes for me when I try to travel back to Cyseal (either by walking back from the forest or by teleporting).
I'm fairly certain it's happening because of something I did in-game (rather than a graphical error), because I was able to identify two save files, one of them is the last save file I have where it's possible to go to Cyseal and the other is the first save file I have where it begins to crash, they're only about 20 minutes of real-time apart.
Spoiler contains details about where I am in the story in those save files:
The last save file I have where it was working was when I was level 10, in Luculla Forest, I accepted the Immaculate quest and got given the quest to do the 'real test', walked up around the dusty area and went back due to low level. Then for about 15-20 minutes all I did was talk to Zigzax about deactivating the barrier and then I created a full save when I was looting the scroll which can deactivate the barrier, rather than destroying the fungi.
So, sad thing is I played for about 8 hours past that point without going back to Cyseal because of how large Hiberheim is, so I'd have to rollback my playthrough if it can't be fixed, or maybe continue playing and hope it gets fixed on its own

More details: I didn't test every single Cyseal waypoint, I did test around 5 or 6 of them though. Also, it was possible to travel to Black Cove, but then I left from the entrance (back to Cyseal) it was the same crash again. Traveling to areas outside of Cyseal is still working perfectly for me. I'm using the Steam version and it's currently patched at 1.0.53. I'll upload the save files and send the link via PM to the developer which usually responds to bug reports, if anyone else needs it, I'll give the link when I wake up tomorrow.