Hello.
[list]
[*]
So, the problem is: physically taskbar apprears right (it behaves correctly responding mouse clicks), but graphically - not always - only in estimately 90-80% switches. Switching is done by keyboard shortcuts.
Examples:
[list]
[*]
See desktop 3:
[url=http://img256.imageshack.us/my.php?image=rightw.jpg][img]http://img256.imageshack.us/img256/6924/rightw.th.jpg[/img][/url]
And desktop 2:
[url=http://img440.imageshack.us/my.php?image=theviolatorcomesfromher.jpg][img]http://img440.imageshack.us/img440/4572/theviolatorcomesfromher.th.jpg[/img][/url]
Now i switch from desktop 2 to desktop 3:
[url=http://img187.imageshack.us/my.php?image=wrongx.jpg][img]http://img187.imageshack.us/img187/1163/wrongx.th.jpg[/img][/url]

See, active window taskbar entry is rendered right, but other stuff wasn't repainted.

[*] Another sample, self-explainatory:
[url=http://img261.imageshack.us/my.php?image=anotherprettyexample.jpg][img]http://img261.imageshack.us/img261/3428/anotherprettyexample.th.jpg[/img][/url][/list]

Machine has Windows XP SP3.

[*] Other thing i saw wrong - is when i hide taskbar, system tray and start button - doesn't see them, but on resize windows acts like items above aren't hidden and then i cannot make window "fullscreen":
[url=http://img510.imageshack.us/my.php?image=sadlynotfullscreen.jpg][img]http://img510.imageshack.us/img510/5933/sadlynotfullscreen.th.jpg[/img][/url]
Note: desktop color is black and taskbar is on a left.

But this is less major problem than previous.[/list]

So, it would be good to permanently use your soft, but a problem makes it less comfortable.