My Reprpap is finally working again!
Since I upgraded to the Sanguinololu board I havent been able to print, as it just randomly would skip when moving X or Y or both...
Yesterday I got told that a bug in the Sprinter firmware was fixed in experimental that sounded like my issue. I downloaded it and flashed it and after a little tweeking I'm printing again!
Now my prints are walking off the printer! :)