

And occasionally, randomly, the modifier keys on my (otherwise unsupported by a driver) Microsoft keyboard swap their functions (I have them set to the proper Mac keyboard layout of Command on the right, Option on the left, using the OS X Keyboard prefpane), a problem which is often remedied by unplugging not the Microsoft receiver but the Logitech receiver. Doing this also causes my button configuration to be screwed up I have the thumb button on my Performance Mouse MX set up for Mission Control, and it stops working entirely after unplugging and replugging the Unifying Receiver. It works again, for an indeterminate amount of time, and will often fail again, especially if my Mac has just been started up. Logitech's solution, as per their forums, is to unplug the receiver and plug it back in again. Oddly enough, all the buttons still work though. Now, since the 10.11.2 update has come out, my mouse will often lose the ability to track, stopping the cursor dead in its tracks. Everything had been working properly using v3.9.3 on El Capitan.
