>>>This probably not any help, but that behavior is more prevalent when the clicking is "rapid".
>>>
>>
>>Thanks, Sam. I assume from your reply, that you've seen it too. I'm not clicking really quickly, I just want to change order and see the sorting arrows. On the 5th or 6th click I do not see the change.
>>
>>But may be I need to introduce some check to see, if the previous click was really processed... I need to think on this idea.
>
>Have to looked atyour _DBLCLICK settings?
>Sammie

Thanks a lot for your advice. In my case I use a single click. Do you think, that single click is somehow interpreted as doubleclick and not the opposite?