hotmag

I have WB5 and I use different vista skins (aero clarity, vista xp, etc) but sometimes when I start up my PC, the icons on the taskbar appear large and distorted and the clock has gone onto two lines. I can sometimes correct this by applying the default XP skin (which seems to reset the icons to normal size) and then re-applying the vista skin. Is there a known reason why it does this or is there a setting I should change? Any help will be appreciated. Thanks, Mike