Hi shailendra here
i am having the same problem, had installed WB 7.95 Beta installed, when i installed the final version,,of WB 8.8.0... Display fusion taskbar doesnt skins correctly,
there seems to be a blurry transparent image ,, earliar the main monitor taskbar used to replicate through DF but not anymore,,,
then i changed the skin to modified aero or aero , DF taskbar came back, but its not working with other skins,, lator on i uninstalled the WB 8.0 final ,, and restarted machine,
reinstalled the WB 8.0 final again,, applied my desired skin , and at this point it seemed like the reinstalling worked for me ,, but,, when i restarted the machine again,, there goes my DF taskbar,, even updated DF also,, but of no use,, the problem remains,,
and yet onther problem i noticed is , titlebar text , window info is also missing when i installed,, WB 8.0 final ..
so i decided to GO BACK to WB 7.95