Ask a Mac Question, Get an Answer ASAP!
Hi there and welcome
Power off the mac
Then start the Mac and hold down the Command and R keys at startup.
Hold these keys until the Apple logo appears. After your computer finishes starting up, you should see a desktop with an OS X menu bar and an OS X Utilities window
choose Disk Utility from the Utilities window, or from the Installer menu if you're started from an installation disc.
Click the First Aid tab.
Click the disclosure triangle to the left of the hard drive icon to display the names of your hard disk volumes and partitions.
Select your Startup Disk (usually named "Macintosh HD").
Click Repair. Disk Utility checks and repairs the disk.
Let this complete and when it has, tell me if you still have the problem please.
I will opt out for another expert to work with you
It normally happens with the "Swipe between full-screen apps" option on the magic mouse. Swiping two fingers across the mouse will move to the dashboard on the left or other desktops on the right.
You can disable in System Preferences > Mouse > More Gestures > uncheck Swipe between full-screen apps
Also try this:
Good morning, did you still need help on this ticket?
If not please RATE 4 stars or above and I will close the ticket.