OK, I've determined exactly which update actually caused the problem. It was the one that took it up from 0.15.2 to 0.99.3. By forcing it to use the 0.15.2-0ubuntu8 version, I regain proper precision (although mouse speed is significantly lower - probably would require tweaking).
I'll see if I can figure out what actually caused the problem, but I'm no driver programmer (I'm a mathematician, the language I'm most proficient in is MatLab).
OK, I've determined exactly which update actually caused the problem. It was the one that took it up from 0.15.2 to 0.99.3. By forcing it to use the 0.15.2-0ubuntu8 version, I regain proper precision (although mouse speed is significantly lower - probably would require tweaking).
I'll see if I can figure out what actually caused the problem, but I'm no driver programmer (I'm a mathematician, the language I'm most proficient in is MatLab).