>>Hi everybody,
>>
>>VFP6.0 SP4
>>
>>When I run the following program on some specific tables, it crashes VFP. Do you see the reason for this? File could be empty or not, it doesn't matter.
>>
>
>I would suggest that you copy this table into temporary database and try to narrow down the cause by removing one by one rules, triggers and so on.

Thanks. Did you ever see the similar behavior? It's not a normal trapable error, it's a VFP crash on alter table command. I think, I'll try to run ALTER TABLE on one individual field in a time to determine the reason.