Red dot that closes an application becomes black and crashes when you click

If I use a mouse Mighty Mouse or Magic Mouse or Magic Mouse 2, the small red candy that closes an application frequently darkens when I click it. It freezes the app. I can still move the mouse cursor, but nothing else open or close until I click on the desktop, then click again on red gumdrop for the APP. This happens on all sorts of applications, Apple and third parties. It happens almost every time, but not always.

This started after I've upgraded to a new trio of Apple keyboard, mouse, and trackpad with rechargeable batteries. I used a Mighty Mouse Wireless before getting the Magic Mouse 2. Because the edges of the Magic Mouse 2 literally cause my fingers hurt, for a while, I used the two mice. Maybe two mouse active at the same time have caused the problem. I looked everywhere in my library to the appropriate to throw files user preferences, but it left me speechless. I even tried resetting the PRAM and SMC resets.

This behavior has migrated to a second iMac when I used Migration Assistant to import my main user account to the new machine. This machine's human interface devices are an Apple wired aluminum keyboard and a wired Mighty Mouse. So I'm sure it's a corrupted preferences file, but I don't know which.

The two iMacs are 27 "(end-2012 and the end of 2013), and both are running macOS El Capitan 10.11.5 with all the updates."

Any ideas on what is happening or how to fix it? Thanks in advance.

Have you tried to "Force quit" the app (s) affected as and when the problem occurs, followed by a reboot?

If the mice are sitting close to each other they are likely to interfere, although the button color change is not something that I've met before.   Disconnect the old mouse because only Magic Mouse 2 will work correctly with El Capitan.

Tags: Peripherals

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