Have you contacted your VAR?
Have you already resolved your problem?
I have the same problem with my task pane...
did you try to reset your solidworks registry, because even if you uninstall the software completely without deleting the registry remains then sometimes the problem will not go away even after you reinstall
Then browse to HKEY_CURRENT_USER, Software. Then rename the Solidworks folder inside here, so you can get it back if needed. When you then open SolidWorks, it will create a fresh directory for you to work with.
Had this problem today.
Restarted Solidworks a few times. no luck.
Turned the task pane tabs on/off, turned off some add-ins to try to give it a nudge to reset/reload, no luck.
Reset my toolbars to default and restarted SW, still didn't seem to work.
Clicked wildly in the general area the pushpin and dock icons are in the top right corner of the window. It soon showed up docked to the rest of SW, functioning correctly.
Upon closer inspection, Solidworks pdm is not functioning correctly, but other panes seem ok.
I ended my day yesterday with task pane tabs undocked (normal for me) and auto show disabled (not common), and had blank unresponsive task panes this morning when I started SW. I wonder if that combo contributes to this glitch?