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Last day I have installed tight vnc server on my PC. After reboot my window-decoration options were changed, two more workspaces were added and xfce-panels went solid color (previously they were transparent). The problem is that I cannot change my panels to be transparent - this option is no longer available. Any ideas how to fix it?

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Same problem here, i log in XFCE session, when i turn back xubuntu session. Transparency gone.. 2 more workspaces... And on panel appearance tab, i can't see alpha slider anymore.. – user46578 Feb 15 '12 at 21:57
up vote 6 down vote accepted

Enabling compositing in window manager tweaks solved the problem.

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