>>>Lately, I ran across strange problem with checkboxes in VFP. Sometime, it >Usually, just This.Refresh in the Click does the trick. You've tried that?
>
>I tried your suggestion, but it won't help much... Any other ideas?

Not much, the problem disappeared a long time ago for me. But I also have code in the DblClick event of all my checkboxes:

This.Value = !This.Value

(Could it be related to _dblclick speed?)