I suppose this MIGHT be a distro-related problem with the beryl-manager startup script. otherwise, feel free to close this as UPSTREAM. the xfce desktop wallpaper behaves oddly when the windows manager is set to beryl: if I click on it, it moves up for the height of my bottom sidebar; if I click on it again, it goes correctly behind the sidebar again, as if it were some sort of maximized window. workaround: launch it after beryl-manager. notice that I said beryl-manager, NOT the beryl windows manager: the default windows manager for beryl-manager can be, in fact, xfwm4. it doesn't matter. 1)launch beryl-manager (any WM will do) 2)go to Settings->Desktop Settings 3)uncheck "Allow XFCE to manage the desktop" 4)check it again. The problem will be fixed until next login. You may as well kill beryl-manager and restart it but, as long as you don't log out, the problem will not be there any more.
*** This bug has been marked as a duplicate of 155490 ***
Dupe.
