i had trapped a guard in a house in ardougne. i started stealing from him and he actually walked straight through the side of the building and off into the market area. anyone had this before?

That's been happening for a long time.

Nope, the only thing I've experienced simliar to this is ages ago when I was pickpocketing Master Farmers, and I got one trapped in a building, in the corner. After about 10-15 minutes of pickpocketing it, it suddenly disappears, and respawns outside again. But yeah, I've never heard anything about this.

darn them. The one way of good old thief exp