TLB toolbars disappear between virtual desktops

I have the Windows taskbar docked to the bottom of the desktop along with a TLB toolbar containing the Virtual Desktop plugin, configured for 2 virtual desktops. I have 2 additional TLB toolbars docked to the top of the desktop. When I switch to the second desktop, the toolbars docked at top disappear. When I first saw this I thought, how cool to have different toolbars for each desktop. I created a new toolbar on the second virtual desktop but, when I tried to dock it to the top, it too disappeared. I switched back to the first desktop and the toolbars reappeared, including the one I added from the second virtual desktop. I didn't know if this was a bug or not, I searched the forums but didn't find anything information pertaining to this issue so I thought I'd report it.

Windows XP SP1
TLB v2.2.0.18 RC3
Virtual Desktop Plugin v.0.2