Audio Track Effect Tool flashing

Hi folks:

Another quirk to add to the list for MC8.5 – the Audio Track Effect Tool 'flashes' intermittently and repeatedly for 2-3 second bursts.  Used to do that a bit in Yosemite 8.4.4, but now it does it non-stop.  Makes it pretty difficult to adjust channel strips, etc.

I recall reading of others with the same issue?

Best, JIM.