Comment 11 for bug 999929

This bug appears to be related to Gnome 3. Here is what I tried: On a Windows 7 64-bit host, I installed Ubuntu 32-bit as a VirtualBox guest with Unity. Seamless mode behaved as in the bug description (i.e. clicking on any Unity window caused all Windows 7 windows to disappear). Then I created a new vm with Mint MATE 32-bit. MATE uses Gnome 2. Seamless mode worked perfectly. Then I created yet one more vm with Mint Cinnamon 32-bit. Cinnamon is based on Gnome 3. Seamless mode failed completely. I couldn't see the taskbar/panel or anything when going full screen.

From other forums, I have read that other have tried various Gnome 2 and Gnome 3 (and other) desktops. Gnome 2 based ones work reliably. Gnome 3 ones fail.

I am going to try bare Gnome 2, bare Gnome 3 and Xfce just to check, but I think the problem appears to be with some interaction between Gnome 3 and VirtualBox seamless mode.