Snap to face not working

disanski

Hey everybody. There it goes another minor but frustrating problem I am getting: I am drawing a spline with snap to face on and while setting the verts everything is fine, but when I go back and try to move some of them ( to reposition them more exact) the snap to face is not working at all. I tried activating snap to verts and grid points but no result as well. Any suggestions. Thanks in advance