When using X with an ATI Rage 128 (8 meg ram) card programs such as konsole, xterm, the gnome terminal and other programs that view large amounts of text will apparently randomly display areas of text on other parts of the desktop, bot inside and not inside the application's window. This happens both in kde and gnome (tested with e and sawmill). The configuration for the X server (SVGA) was found with no errors for the card by Xconfigurator as an ATI Rage 128 (Generic), or ATI Rage expert 99. both setups at first appear to display correctly but the problem shows itself after apparently a random amount of time.
Appears to be similar, if not the same, bug as bug# 12854
*** This bug has been marked as a duplicate of 12854 ***