I have this issue as well (along with many others it would seem), and although I have the entire Object Desktop set installed, I've diagnosed the issue down to Fences by variously performing a system cleanup and uninstalling each Object Desktop program individually + restarting to see if the taskbar issue persists.
Sometimes, the bug will push the right-hand side icons on the taskbar so far to the right that they are clipped off the screen:
And sometimes, the bug will overlay other program icons on top of the existent taskbar icons (I'll post a screenshot of this when it happens again.)
The problem is, as others have said, solved by uninstalling Fences. The bug persists in both cases - when only Fences is installed, and when all other Object Desktop programs are installed.
I use Fences to create multiple different desktop "screens", I don't know if that has anything to do with what's causing the bug - I'll try to diagnose it later.