Opps, sorry, it's the free version just downloaded. Windows XP. Which ever monitor I have it on, I get all these taskbar items...
I've also seen this on my work computer (on both monitors)
Yeah, it does look like OD isn't cleaning up the icon when prefs are opened.
Edit:
OK, confirmed, it's a conflict with MultiMon (dual monitor taskbar). It you have OD on mon-1 and open prefs to scoot it to the other monitor (the one with MultiMon on it), you see about 19 taskbar buttons open up as OD goes to mon-2. Bring it back to mon-1 and it shows as the pic I posted above.
I guess that absolves OD of any bugs, since it only happens with MultiMon loaded... MultiMon has a new "pro" version, I'll download and try them together...
Edit/Edit: Problem does not appear when using UltraMon.