My window moves offscreen and the desktop changes.

Hello sterling r,

Thank you for your very quick reply. I looked at the four boxes in Screen Saver/Hot Corners and, alas, there is only a dash ( - ) in each box, which I assume means there is no action assigned to any hot corner.

What happens is this: I have my normal desktop, folders in the background, and a personal photo as the wallpaper. I open any application or my Opera web browser. If I happen to drag the application or browser window to the lower right part of the screen, the entire background swipes off to the left (like a swipe in a movie edit). The background image has changed. My personal photo is replaced by either a blank gray screen or a default Apple wallpaper photo. My folders are still on my desktop. I tested it, and this only happens when I drag something to the lower right of the screen (acting like a definite hot corner). But, as I said, I see only a dash in the settings.

The only way I can get it back to the original desktop is to close the application or browser window and click Opera in the dock and go up to History and re-open a previously closed window. Everything then swipes back to normal. Very strange!

Hello PsyDye,

Thank you so much! You have SOLVED my problem. I didn't even know what multiple spaces was, but somehow I had two of them. So I deleted the additional one and now all is well.

Much appreciation to both you and sterling r!