>>>>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?
Two "single" clicks that are done in less time than the interval set with _DBLCLICK will be processed as a double click.
You might stick in a line of code

_DBLCLICK = .05 && minimum

and see if the problem goes away.
Don't forget to reset after you finish. The default is .50
Sammie