Can't see Launcher after starting an app

Once I have launched an app from the PortableApps Menu, the launcher hides itself and I can't find it anymore.

It used to be available in the Alt-Tab menu but not the taskbar. Now, it's nowhere to be found.
I'm running XP on a school computer, so no/limited debugging possible.
Any idea what's happening? It's a real pain to open the apps using their actual .exe files, and when I do use this I have to eject it while it's still going; not a good practice.