After updating the structure of a table using Stonefield Database Designer, I get a message saying the Database is invalid. The problem is I can't validate the database because the message is stuck in a loop, and I end up having to force Foxpro to quit. This message does not happen right away, but some time after I have quit out of the Stonefield Database Designer.

After forcing foxpro to quit, I open the database exclusively and validate it. I get a message that some of the tables are missing a required value.

I am using VFP 6.0 SP3 and SDT 5.1d.