The topic says it. Happened today. I went dungeoning in the Emerald Queen gate and Clockwork Tunnels Mechanized Mile. As I went through the dungeon, I was attacking some robots and suddenly, fell through the map. I could hear the monsters and all and tried figuring out how to get out (I couldn't see myself!) After figuring out, checking the faq, the game froze, then my computer froze.
Here are my computer specs if it helps any.
AMD Sempron(tm) Processor 3600+
2.00GHz, 3.21GB of RAM
Windows XP Service Pack 3