Can only Extrude or move vertices/edges in a pre-set distance I just started using blender yesterday to model a character. I got through most of the head but now, every time I want to move vertices/edges or extrude, I cannot do it properly. If I try, it moves at a pre-set length that I can't seem to get away from. Please help!

You can see the file here (http://s000.tinyupload.com/?file_id=61829621657266848046)
You've turned on Transform Snapping in increment mode.
All transformations will be done in increments determined by the size of the grid.



Press ShiftTab to exit snapping

Please read the manual page for more information on the usage of snapping.