I had the same problem On Win NT 4. You have to lock the Table header before doing an insert. Becasue when you do an insert VFP tries to lock the header.

Check to see if you have access. If so Lock the header then use the insert coimmand.

I've got a Function Called Headlock

Can use this function in a loop or use a timer event.

IF RLOCK("0",alias())
RETU(.T.)
ENDIF

EG.

IF Headlock("MyAlias")
Insert Into MyAlias
Unlock
Endif