I have found a bug with a few applications such as Gimp 2.8 and TuxGuitar on 12.04. Whenever I start the application, its icon will not appear on the Alt-Tab switcher and it will not appear on the Launcher. But, pinning the application to the launcher and then loading the program will allow the icon to be on the switcher.
Here is my question: Should I report this bug to Unity or to Gimp/TuxGuitar?