vertices don't move or extrude properly i have this problem with my model as i was following a character modeling tutorial and suddenly my vertices are stuck on their positions.. and i do not remember what settings i changed(may be its because i once selected all pressed W and smooth), but now whenever i try to move/extrude a vertex it either doesn't move at all or moves only when i drag the mouse far away.. like in the picture. Please help.
Try to disable the Snap option, it might be because your vertices stick to the grid: