I also have this issue on Oneiric. The only application that does this, at least the only one I noticed, is Libreoffice Impress. When this happens to me, the window also displays the global menu of nautilus (for some reason) and the Impress icon disappear from the launcher.
I also have this issue on Oneiric. The only application that does this, at least the only one I noticed, is Libreoffice Impress. When this happens to me, the window also displays the global menu of nautilus (for some reason) and the Impress icon disappear from the launcher.