Middle mouse button doesn't scroll anymore

view story

http://askubuntu.com – I'm running Ubuntu for a long time now on this box without any major problems. But a few days ago after installing updates and restarting the computer (Lenovo ThinkPad X200) the middle mouse button doesn't let me scroll anymore. Normally I always scroll using the middle button and the trackpoint, but it just stopped working right after restarting the computer. Now I have to tinker around with gpointing-device-settings after each and every logon (btw.: just setting the right button straight away doesn't work, I need to set it four to five times to different values and then to the middle mouse (HowTos)