>Salut Sylvain,
>
>Just out of curiosity. Do you ever re-define the columncount of the grid? I know this tends to scrap all the code that can be in the various controls. It will reset the grid to a blank new grind with default controls in it.
>
>Mike

Salut Mike!

No, the columncount remains unchanged. Plus, the column that creates the problem is the second column out of something like 14. What bugs me the most is that it will occur only if 2 specific forms have been opened. I can't find any relation about those forms. None of those 2 forms have a control with that name; one of the form only has a FlexGrid activeX and a few buttons.

Even better - the form that has the problem is called frmDT_Contremaitre and the form with the FlexGrid is called frmDT_Horaire:

Open frmDT_Contremaitre: everything works fine
Close frmDT_Contremaitre
Open frmDT_Horaire
Close frmDT_Horaire
Open frmDT_Contremaitre again: we get the error, so press ignore...
Close frmDT_Contremaitre
Open frmDT_Contremaitre one more time: everything works fine.

Forgot to mention: VFP6 SP5 on NTWorkstation 4 SP4, with data in SQLServer7 on the server.

I'm starting to think it has something to do with the alignment of the planets, solar flares and why snakes don't have a handle. Also possible that all the computers this application runs on have been abducted by aliens...