Okay, I am now exploring the Courtyard and killing Kath Hounds; there are a series of what look like "perspective lines" which I am walking thru (almost like hanging ivy). I have seen these lines before in the Undercity. Anyway, frequently the game crashes dumping me back to the desktop (obviously I'm on a PC) or I may find that my character cannot move. I did the patch a while ago.
No problem. It runs smooth as silk on my machine, but my uncle had similar problems. It was unplayable for him because it kept crashing, and he happened to stumble on the fix on the Lucas Arts forums.
Good things come to those that wait--but only what's left over from those that hustle.