mateo_salta suggested a possible solution in a comment that may work for some people experiencing this problem:
what about gnome tweak tool,
noobslab.com/2011/10/…
the option to "let file browser manage the desktop" does that do
anything?
– mateo_salta May 27 '12 at 19:31
That page (the article, probably not the comments, advertisements, etc.) is licensed (see the banner under the copyright statement) CC-BY 3.0, which permits inclusion of it here, in any part of it, with or without modification, so long as proper attribution is given. (This is because user-contributed content here is licensed under CC-BY-SA 3.0.)
Install GNOME Tweak Tool in Ubuntu 12.04 Precise Pangolin/Ubuntu 11.10 Oneiric Ocelot
General tweaks (for both GNOME Shell and Unity) Change themes, fonts and more with GNOME Tweak Tool

Features:
- Install and switch gnome-shell themes
- Switch gtk/icon/cursor themes
- Switch window manager themes
- Change
- The user-interface and titlebar fonts
- Icons in menus and buttons
- Behavior on laptop lid close
- Shell font size
- File manager desktop icons
- Titlebar click action
- Shell clock to show date
- Font hinting and antialiasing
In Ubuntu 11.10 Oneiric Ocelot there is no built in themes and icon
changer in Oneiric, So easily you can use Gnome Tweak Tools for
changing themes and icons in Ubuntu 11.10 Oneiric.
To install in Ubuntu open Terminal and copy the following command in the Terminal:
sudo apt-get install gnome-tweak-tool
When installation complete, GNOME Tweak Tool should show up as
"Advanced Settings" in the menu. Besides changing fonts or themes,
GNOME Tweak Tool can also be used to disable/enable GNOME Shell
extensions, tweak the desktop, various windows behavior or GNOME
Shell.
Source: Install GNOME Tweak Tool in Ubuntu 12.04 Precise Pangolin/Ubuntu 11.10 Oneiric Ocelot by Umair, posted 10/13/2011 on Noobs Lab (blog) – with slight modification (formatting, capitalization, and image alt text).