Weird flipping screens

[DMark]

I'm having a problem. When I bring a mouse near any active icon or button, the window will change size, the desktop will blur and an image of the desktop will appear in a band above. When the desktop is blurred, it is impossible to click/activate an icon. The screen will quickly flip back and forth. I tried to attach two images to illustrate, but not sure if that works on this forum. Any ideas?

 

[Son-Y]

Possibly it is just "mission control" which lets you switch between apps and desktops. It is triggered by a trackpad-gesture:

To look it up you can go to:
System Preferences > Trackpad > More Gestures

This is where you also can turn this trackpad-gesture on or off.

Son-Y.

 

[DMark]

Son-Y
Thanks but no trackpad on my Mac. However, I applied your suggestion to the mouse and changed the odd mouse functions like mission control launch to function keys, so they're all F#. Problem solved, but still not sure why it started after 5 yrs with no problem. Must be aging mouse....
Thanks again, really appreciate it
D