Don, thanks for posting this one. It is like we have our hands tied, since it isn't a AOLserver bug.
The bug is due to passing a Tcl_obj between threads (in the cd command), and it hasn't been fixed. Apparently the person responsible for this is on vacation or busy. I'm amazed that such a problem would occur and it wouldn't be tagged as a critical bug. On some platforms (BSD derived), using pwd calls cd, so the bug is much worse. I wasn't aware that the file command had a problem too.
Also, the nsv bug has been fixed.