I have used Objectdock Plus a few months ago, but without the System Tray it wasn't much good to me, so I uninstalled.
I have just installed Objeckdock Plus again on Vista 32-bit ultimate using Impulse (which did an auto update first).
When I went to install it downloaded it again, so I have the very latest version.
I created a new tabbed dock, adding System Tray, then removed the 5 auto-generated tabs.
System Tray is still blank, so I'll uninstall again.