screen background problem on F12

[fred smith]

Hi all!

F12 is looking really good here, but I do have one small issue that I'd
like guidance on...

when I change the wallpaper (background) image, it reverts to the original
one as soon as I do one of: logout and in; reboot; use the desktop switcher, 
after which even the original desktop has reverted.

How to make it stick? Even choosing the "make default" button makes no
difference, it still reverts.

And worse, the default image isn't the right size/shape, so it leaves
big white borders on the left and right side of the screen. :(

Never had this problem on F10 or F11 on the same computer.

Thanks in advance!

-- 
---- Fred Smith -- fredex at fcshome.stoneham.ma.us -----------------------------
                      The eyes of the Lord are everywhere, 
                    keeping watch on the wicked and the good.
----------------------------- Proverbs 15:3 (niv) -----------------------------