Hi - the error 12's at 906 relates to renaming VI_JobLog.M4T in MAS_SYSTEM to a job specific file in the VI folder (you can PRINT LogName$ in the debug window).... when it is done renaming, it recreates VI_JobLog.M4T in MAS_SYSTEM. you may have an issue where VI_JobLog.m4t in MAS_SYSTEM is missing, or locked, etc. Good Luck