Hello Vlad.

>> It looks like in VFP7 this bug appears too. See Thread #561359.
Marcia, can you describe the EXACT conditions of when this bug appears? I suppose it is related to data environment. This is because I did never used data environment and did never experiensed this bug. <<

I don't think it has anything to do with the DataEnvironment. It occurs when you specify a ColumnCount in a grid class and then drop the class on a form.