A user here began having strange behavior issues in his AutoCAD sessions. His explode and purge programs would not open as command line entries (even when he typed in "_PURGE", etc..). His LISP routines would pop up dialog boxes even when the variables were to set to keep them closed. Through a lot of diligence on his part, he found that the variable QAFLAGS might be the culprit. He looked at his setting and it was set to 17. All other users here were set to 16. He set it to 16 and tada, his AutoCAD is back to normal. A great find on his part. I hope this might help others.