Desktop size on Imac

[morrowill]

We have six separate accounts for family members on our Imac. Most work well. However, when two of our children access their accounts, the desktop background size shrinks to about 80% of the screen size. The fonts and icons also become larger. When they log off of their accounts, the appearance changes all of the other accounts until we re-start the computer. Re-start makes it go back to full screen size until on of the two affected accounts are accessed again.

I've attempted changes through the desktop appearance menus in preferences, to no avail.

Anyone know what might be the cause of this and how to fix it?

 

[Gregg2]

You don't mention the OS. Always a good idea. You'll see why in a second.

In each account, find com.apple.desktop.plist
I have 10.5.8 so mine is in Users/MyUserName/Library/Preferences
Move that file to your Desktop. Do not delete it, yet.
Restart
Problem gone? Then delete that file, and try to wipe that silly grin off your face.
Still have the problem? Then that obviously wasn't the solution. You can put that file back if you changed any Desktop preferences and want them back. This action will overwrite the new plist file that was created when you restarted.