Scrambled Terminal with Fedora 9

[Rob]

I have recently upgraded from Fedora 7 to Fedora 9 (install from scratch).

It has XFce 4.4.2 installed with Terminal-0.2.8.

When the Terminal is hidden for some time behind a firefox window,
for example, and I get it back to the foreground, it occasionally is
scrambled; looks like the screen of an old black & white TV that has
no antenna connected to it. It's a static picture of random snow.

See:  http://skku.homeip.net/~lahaye/Terminal.jpg

This occurs only with the Xfce Terminal program, which seems to indicate a
problem at the Xfce side.

However, also it only occurred after upgrading from F7 to F9, which could
indicate that it is related to some X11 upgrade, or related to Fedora.

Any idea what this is about?
Anybody else has this too?

Regards,
Rob.