Safari 4 on Windows 7 - Black Thumbnail previews?

[MythicFrost]

Hey, I'm on Windows 7 atm, I've noticed for a while, that when I hold my mouse over safari 4 in the task bar, the thumbnails pop up of each tab but all but the selected tab are black!

So if I have 3 tabs, and I am in Tab 1, hold my mouse over safari 4 icon, I see tab 1 preview, but tab 2 and 3 are black, if I am in tab 2, tab 1 & 3 are black, and tab 2 is just fine.

Does anyone know why?

Kind Regards

[MythicFrost]

Correction*

The thumbnails are fine!
It's when I hold my mouse over the thumbnail and it shows you the tab on the screen, most of them are black.. is this common?

Kind Regards

[jeevesofRKdia]

Happens with mine too...
I think it also happens with Firefox's tabs. Perhaps not, as I use them at the same time sometimes...