task bar isn't properly redrawn after desktop switching

[DeokShesar]

Hello.

• 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:
  
  • See desktop 3:
    
    And desktop 2:
    
    Now i switch from desktop 2 to desktop 3:
    
    
    See, active window taskbar entry is rendered right, but other stuff wasn't repainted.
    
  • Another sample, self-explainatory:
    
  
  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":
  
  Note: desktop color is black and taskbar is on a left.
  
  But this is less major problem than previous.

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