Foxpro kept promt me "A store procedure is executing" !

i can't remember what i did, but now i can't issue a "close all".
i've tried issue: clear all, release all and close table all. (no luck)
worse still can't even quite foxpro. when i issue quit.
foxpro seem to show as "not responding"

question: on what situaltion will cause this kind of problem ?
and how can i resolved this if the user were to hit this kind of problem ??

currently no one else is accessing this database. pls help.