There's a little sprocket that shows up in menu bar ... at the end of the applications section ... it blinks on and off and swaps places with an application a few items towards the right ... then swaps back to the end .. always blinking. I can't open it by catching it with my mouse ... and I can't tag an application in the Activity Monitor. I've got a late model 2013 15 inch MBP. Anyone have an idea what the little sprocket is? Any ideas on how I might identify the culprit application and get it to stop putting that blasted blinking/shifting sprocket in the menu bar?