Comment 4 for bug 326120

Came across this bug report when looking for solutions to the same problem - if I use Firefox or Chromium in full-screen mode, OnBoard does not stay on top despite the OnBoard Preferences set to "Force window to top".

In my testing I discovered that this issue appeared to only apply to Unity 3D. If I switched to Unity 2D, then OnBoard stays on top at all times, even with Firefox or Chromium in full-screen mode.

But after that, I found that NVidia-graphics based machines would persistently put OnBoard behind the full-screen browser regardless of 2D or 3D modes while non-NVidia (on real PC's and VM's using VirtualBox 4.1.20 drivers) would only put OnBoard behind in 3D mode but leave it where I expected in 2D mode. I can alt-tab back to OnBoard only if another window is open such as a Terminal or a Nautilus window. Very much up in the air on this one... :(

I'm using Ubuntu 12.04 fully updated through to today and OnBoard 0.97.0-0ubuntu3. I have not tested the trunk version as described by Marmuta.