> I log in using "select desktop environment" and pick Cairo-dock, does this mean it is window manager
If you select this session, I guess your window manager is Compiz.
> I tried cairo-dock -c, it seemed better
It seems this bug is due to a regression of your video driver... Which one are you using? Proprietary one? (fglrx)
$ glxinfo | grep OpenGL
> Is there someway I can default to cairo-dock -c at log on?
Yes, simply launch the dock with this command, check the box to remember your choice and select "No". Next time, the dock will be launched without OpenGL backend ;-)
> I log in using "select desktop environment" and pick Cairo-dock, does this mean it is window manager
If you select this session, I guess your window manager is Compiz.
> I tried cairo-dock -c, it seemed better
It seems this bug is due to a regression of your video driver... Which one are you using? Proprietary one? (fglrx)
$ glxinfo | grep OpenGL
> Is there someway I can default to cairo-dock -c at log on?
Yes, simply launch the dock with this command, check the box to remember your choice and select "No". Next time, the dock will be launched without OpenGL backend ;-)
$ cairo-dock -A