I lost a WU (maybe the same one actually) earlier in the week.
I recieved this error message:
[22:25:35] Finished a frame (368)
[22:30:05]
[22:30:05] Received faulty work unit.
[22:30:15] logfile size: 278814
[22:30:15] - Writing 279326 bytes of core data to disk.
[22:30:15] end (WriteWorkResults)
[22:30:15]
[22:30:15] Folding@home Core Shutdown: BAD_WORK_UNIT
[22:30:18] CoreStatus = 72 (114)
That and the P21XX's have killed my points this week.