On startup the first time after installation, rhythmbox does not throw up
its window; instead only a small icon in the panel notification area is
added. This is difficult to spot - especially for a user (like me) that
have the panel to autohide by default. When mentioning this, it turns out a
number of people have thought their installtion of rhythmbox is broken in
some way or other as nothing happens.

Suggestion: make sure the default is to open the main window on the users'
screen on first startup.