I wonder if any other non-WASD people have run across an issue that I just figured out. I'm a lefty so I use the numpad for movement options in games. I assign L/R to Num1 and Num3 (or End and PgDn). I ran through the intro level of the game just fine, no problems with any controls. When it opens me up into Martyr's End I started falling through the floor all the time! I tried redoing the intro level, to no avail.

I finally figured out what is going on. I think they left some debug keys activated in-game. When I hit End a lot of the game textures disappear, when I hit PgDn the lights disappear. So what was happening is that I was inadvertently turning off the floor textures when I was trying to strafe left!

Anyway, I can always use AutoHotkey to get around the problem for now. I was just curious to see whether anyone else has run into (or already discovered a fix) for this.