>That will happen if you use a textbox control in a grid for a controlsource that is a memo field. You need to use an editbox instead, and make sure you set the column's Sparse property to .F.

I don't think I use special textbox control. I do replace textbox control with custom control, but I don't do it for memo fields. So it should use the regular textbox control.

If I create a test form and just assign grid's recordsource to table with memo, double click works fine. I'm going to play with assigning column's controlsource in the design and run-time to see, what's causing this weird behavior.