Mouse Clicking
Mouse clicks keep coming up with an unwanted menu, both left and right clicks. Takes several clicks all over the screen to lose those menus.
iMac 21.5″ 4K, 10.13
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Is this an Apple Mouse?
Safe Boot, (holding Shift key down at startup), does the problem occur in Safe Mode?
Safe mode attempts to repair Disks & clears lots of caches & loads safe Drivers, & prevents loading of 3rd party extensions, so if Safe Mode works try again in regular boot.