Mark,

>
>I create a form with a table in the DE.
>I add a grid to the form and set the RecordSource to the table.
>I specify a ColumnCount for the columns I want (3 or 4, etc..).
>I set the ControlSource of each column to different field names.
>

All I can tell you is that you are not crazy, the same thing is happening to me. I used a builder to set the widths. They are absolutely fine, and no run-time code touches them. Yet, when the form runs, BANG, they are at that 'Default' width. I've triple-checked my code and I'm doing nothing at run-time. At design mode they are fine, and run-time they are different.

IMHO, it's a bug in VFP.