Hi, Often when scrolling lines are mixed or have black boxes --and is complicated to edit code with programs such as Kate. The video card is "ATI Technologies Inc RV610 [Radeon HD 2400 XT]" with the "radeon" driver in /etc/X11/xorg.conf. The problem persists with or without desktop effects. KDE version: 4.4.5 in Debian Sid. Any workaround? thanks! Regards, -- Benjamí http://blog.bitassa.cat