I'm using Gnome Shell with the following extensions: weather, dock, window-navigator, user-theme, alternative-status-menu, noa11y. I checked "Have file manager handle the desktop" in Gnome Tweak Tool, at first the desktop icons were shown regularly, but upon reboot they went awol. Is there anything else I need to do or could it be a conflict with any of my extensions? Thanks for your time.
Ubuntu – How to enable Nautilus desktop management in Gnome Shell
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Just to make sure - Did the instructions you followed involve extracting the theme to /usr/share/themes? If not you can find a more detailed description of how to install a theme in 11.10 here.
The error message you are reporting with gnome-tweak-tool occurs when either logging into Gnome-Classic or if logging into Gnome-Shell - but it doesnt allow a full Gnome-Shell GUI but reverts to Gnome-fallback.
From your latest edit - this is the case - the screenshot shows that you are using gnome-fallback. This occurs when 3D acceleration fails.
N.B. Gnome-Shell should look like:
To get the full Gnome-Shell GUI, check that your virtualbox settings have 3D acceleration checked, 128MB VGA RAM and that your host graphics supports 3D Hardware acceleration.
Best Answer
Unfortunately, this is by design.
As per this blog post on the design of gnome shell:
As such, it was removed from gnome shell as far as I can tell.