I ran into a problem this weekend and I had to abandon my game (running v3.5 on A19.5 stable, using Mod Launcher).
I was playing on DFalls-VSmall1, I went to Trader Joel (I think), then started exploring the town around the trader. As I followed the road northward (following the towns outer road) I received an error in the console, then as I kept driving North I started sinking into the ground, I backed up and went South, then hit an invisible wall, then I went East and hit an invisible wall. I've had this once before and the fix was to exit and reload, then leave the area by moving toward a known good area and saving/reloading at the invisible walls until the issue goes way). This time I cannot reload, it is stuck at the respawning stage (the world never renders, I just see the default loading image after the music fades).
Player position is -436.3, 64.8, 2101.6 (which would be SE of the road I was on that triggered the error messages)
I received two console errors during load (in red text).
-397, 74, 2144 Block cntCollapsedSolarbank
-371, 66, 2128 Block rockResourceBroke2
(this is what I wrote down, hope I got the whole line)
I suspect there is a poi in this area that is not compatible and it broke something. If it is the map anyone should be able to reproduce it by starting at the trader closest to the player coordinates noted above and following the road northward.
I tried to force kill my player by ID, but nothing happened (well, I heard my player die, but nothing happened visually).
I also tried to teleport away, but still nothing (world never renders). I may have not entered in valid coordinates, so this could be user error.
I tried to remove the specific region file from the save directory, but the tool I used said I was at 4, -1 and there is no region file by that number in the save folder...so...yeah.
Not expecting a fix, but thought I'd report it in case it can be fixed for others.
I think I'll try an RWG 6k map next as long as I can get one with enough books in it (plus the three DF prefabs of course).