Xchat never appears in the application switcher.
I use Ubuntu 2012.04 with Unity, very few tweaks.
Always reproducible with these steps:
- Open Xchat
- Press ALT-TAB
- Result: Xchat is not displayed in the application switcher, see screenshot

Any idea what could be causing this?
If I switch to a full-screen terminal and then reduce this terminal, then Xchat just disappears. It can't be seen on any workspace (checked using workspace switcher), but the process is still running. Is there command-line way to raise an existing window?