Bug with bind mesh to armature

hey everyone,

new to Blender and this site. i created a mesh and it’s armature, but when i move my ik handlers in pose mode my mesh disorts wildly. at first i was experiencing a bone heat failure.

i found a youtube video: http://www.youtube.com/watch?v=IZPqxADetWE&noredirect=1 that helped me overcome the bone heat failure and bind the mesh to the armature, but it still hasn’t binded properly.

here is a quick video of what happens:

i have checked the vertice groups and manually unassigned all vertices to any bones, except for the left leg’s bones (toe, foot, shin, and thigh). i was hoping that would at least mold the left leg correctly and i could manually assign vertices to the other bones.

i’ve verified that no ik handler bone has any vertex assigned to it and selected each bone one at a time to set the Deform checkbox (i made sure all ik handlers were unchecked as well).

my other problem is with the movement of my armature. when i bring his leg backwards its a fluid movement, but forwards causes it to snap in place. weird.

i can’t find any information to help me anymore online. i hope someone here can offer me some advice.