Well I'm fucked.. I am experiencing the same problem Garlyle's friend is.. A wall that shouldn't be there is making it literally impossible to progress. On floor 29, you go down 2 interesections (are forced to because of orbs), and the 3rd one is a whole row of intersections without crystals, so you can go whichever direction you please. you HAVE to go left one intersection, then down to proceed. I did just that, and explored around, and saved, and quit.
Now today, I can't go left, there's a wall there, and there is no way to get to that teleporter south of 1 intersection left without turning left there.
Garlyle, please tell me your buddy fixed his problem? if so how, because I'm pretty much at the end of the game (For me) unless it gets fixed for me.
update: still haven't fixed my game breaking issue. Any advice on /wristing? >=P
moar update: I give up I'm irreversably stuck. Is there some kind of way of editing the map or something? Or maybe a way to cheat and trick the game into thinking I have the floor 20 waypoint?