Desktop Icons keep resizing themselves

[RW]

After running certain applications, all my desktop icons resize themselves
smaller- maybe 10% or so.

A right click | Refresh always restores them to their proper size.

Any idea why this is happening and is there some way to stop it?

Thanks.

 

[STAN STARINSKI]

Have you accidentally kept Ctrl button down while scrolling mouse wheel?
That changed desktop resolution, and increasingly it also zooms in/out in
many Windows applications