Note: This doesn’t seem to be a relevant solution for macOS Catalina anymore, since we were unable to locate the relevant preference files in the user-accessible portion of the system drive.įirst, start up Finder and then navigate to Library > Preferences. This ensures that you can always undo things if something goes wrong. Specifically, we’ll delete the plist files related to the mouse and trackpad.īefore you do that, we strongly recommend you make a Time Machine backup of your Mac.

We’re going to delete those files, forcing macOS to rebuild and reset them to default. macOS uses “plist” files to store your preferences for various aspects of the Mac. If none of these fixes work, then we’re afraid you’ll have to resort to a mildly technical solution. Just hold command+space to launch Spotlight Search. In the Force Quit Applications list, look for Finder.

The good news is that restarting Finder is fast and easy: If it goes belly up, you’ll lose the ability to drag files from one place to another. The Finder application is the beating heart of your Mac’s file management system.

Assuming that you’ve eliminated the mouse hardware itself as the culprit. If it happens everywhere, then a system-level issue seems likely. Is drag-and-drop not working on Mac between some apps but works fine with others? If only certain applications don’t work correctly with this common mouse function, you should look for answers that relate to the specific software in question. This can interrupt mouse tasks such as dragging and dropping something. Some mice, like the first-generation Apple Magic Mouse, are notorious for constantly disconnecting while you work.

Check the buttons for dirt or grime and make sure that the USB plug or cable isn’t damaged.

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