Problem with bmesh

im trying to retopo a sculpt i made using the bsurface add-on. it was working fine the other day but now its gone crazy
heres what I’m trying to do

heres whats happening

heres another angel without the head

is this a bug or am i doing something wrong?

im using 2.65 on osx 10.8.2

EDIT: seems to be a problem with the grease pencil, its drawing through the surface

EDIT2: if i draw more then one stroke with the grease pencil it doesn’t work

EDIT3: redownloaded blender all good now