Well, did you have the basic version of Object Dock before getting the Plus? Did you uninstall the basic version first?
I run ObjectDock Pluse like you do with a Zoomer and a Tabbed Dock. On the Tabbed Dock I have Taskbar and System Tray along with some three other tabs. I'm on a XP Home 32 bit system but basically they should work the same.
What else do you have on the Tabbed Dock?
Have you installed any new Docklet that might be causing the problem?
When you installed Object Dock Plus did you use Impulse?