Unidentified Flickering Menu (UFM) Phenomenon

[Trevor Hopkins]

I've noticed that when I have a menuPick handler running from a menu in the 
Mac menubar, that on occasion, when selecting among options in any given 
menu, the menu bar flickers. That is, I select a new option, the handler 
checks the new menuItem ("!c") and unchecks the previously checked menuItem, 
and in the course of this check/uncheck process, all of the "buttons" in my 
menubar disappear and reappear very quickly.

Can anyone explain the phenomenon I am seeing?

Cheers,

Trevor Hopkins
Exeter, UK

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