Apple monitor keeps changing background pattern

I have been using an inexpensive 18in flat panel monitor as a second screen with my MacBook Pro. I borrowed a friends 20 Apple monitor and tried it instead of the 18in, but the background screen pattern keeps changing every 15 minutes or so. I have reset the preferences NOT to change a dozen times. Sometimes it will accept me setting it to Panther Aqua Blue, sometimes it will not, but it always soon changes the pattern to one of the Apple Plants pattern and then changes again every 15 minutes or so. The "change picture" option is not selected. This never happened with my old cheap monitor. Any suggestions?
Thanks
Henry

delete the file homedirectory/library/preferences/com.apple.desktop.plist and log out/in. set your desktop background as you like it. it should behave normally now.

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