Sign me up for the same problem, and it's actually quite annoying, but i did find solutions on another forum posting the same issue, and a guy came up with this.
Most of the solution are really dumb. Do these people have jobs?
No wonder the US is #9.
Open Task Manager and Regedit.
++ on the Start Menu & select 'Exit Explorer'
In Regedit, navigate to:
[HKEY_CURRENT_USER\Software\Microsoft\Windows\Curre ntVersion\Explorer\Streams\Desktop]
delete the value named 'Toolbars'.
In Task Manager, select 'File' -> 'New Task' -> type 'explorer' to restart
the shell.
If that doesn't do the trick, repeat deleting 'TaskbarWinXP' as well. (I
can't test right now).
And it's reported by other users to have worked as intended, but i will say that i have not tried this solution.
I also found this which seems to explain what Shinmila H couldn't, why this happens.
And yes, i tried this solution, and it worked like i charm.
Often times Windows will refuse to hide because it mistakenly believes there is still a tooltip balloon open. (I see this a lot myself with APC's Powerchute Personal Edition.) Unfortunately the only way to get your taskbar to properly hide again (and I don't
mean uncheck the "Keep the taskbar ontop of other widows" option for a quick fix) is to restart the machine so that Windows resets the tooltip balloon status. What a pain!
Thankfully through my inability to let it go and hatred for this problem I have written a file that will fix this! (Works great on my Vista machine!) All the program does is overwrite the phantom tooltip balloon and then clear the tooltip balloon and Tahdah!
The tooltip will stay up for 10 seconds so that you can read the info on it (just telling you what it does and how you can contact me if you have any problems). You can close this tooltip balloon like any other by clicking on it, or if you mouse over the program
tray icon it will close itself instantly.
*** Edited to remove third-party links ***
I really hope this helped.