>Hi,
>I have a VFP desktop application. It contains UI, and will loop and check a table to do some clean up job.

>DO WHILE .T.
>*-- Check table
>   IF INKEY() = CertainKey
>      EXIT
>   ENDIF
>ENDDO
>
>*-- No READ EVENTS is issued
>RETURN

>I use Window Task Scheduler to run this app on window startup. Its been launched, shown in task manager|processes tab, but invisible mode and seem not executing (I have logging code, but seem nothing been written to log file). No error been logged also.
>
>It works if I select "Run" from Windows Task Scheduler menu.

Hmmm. Do you have a CONFIG.FPW in your system path somewhere that sets SCREEN=OFF? It could be picking it up when it starts the app from the scheduler.