Right-click intermittently stops working

using mac/yosemite, cc 2015.2.

 

some days there no issues, days, today stops working after while, , system restart seems have no effect. click on clip, no pop menu.

using both wacom tablet , mouse, neither work.

 

does else have issue?

i've seen other mac users report similar.

 

i haven't seen occur windows users.

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