m-marti, is your mouse for some reason enabled as an extended device? If yes, disable it. You wont lose anything as mouse does not provide any extra info for extended devices.
As far as I am aware from my testing with mmiicc, it only affects extended devices and a specific event deliver mechanism known as event history buffer that is provided by X. It's a known source of trouble. According to my tests with mmiicc 2.7 does not exhibit this problem because of this commit: http://git.gnome.org/browse/gimp/commit/?id=dbf844c012894166e312470f0d98560d5e426613 With this I disabled the history buffer use because there are plenty of cheap tablet drivers that get it permanently wrong and 2.7 has event fill that prevents even mice from drawing polygons when moved fast, so milking every single event out of the device is no longer essential.