Scroll Bars in iTunes broken

Hi guys

ok, strange one this. The Scroll bars on the side of the window in itunes, for the playlists, the fields for selecting artists, genre and album have all disappeared. They've just been replaced with White. It still plays music and allows scrolling with the mouse ball, but can't scroll using the point and click method.

Have restored iTunes from time machine, re-downloaded iTunes, and even copied my iTunes library back from my MacBook to my MacPro, as its working fine on my Macbook

very strange.

Can anyone help? I'm now stump!

R