BIG problem with forces

hi,
I have a big problem with moving with forces,

I have a treecollision that is my floor and my character when moving with forces when encountering a line draw by the debug lines of the treecollision
it jumps relative to the force it has,

I know im using big forces and gravity in my objects because I havent found a good way to scale my objects, but It shouldnt happen ....... im walking in a plane floor and it still jumps....

here is a video of my problem
http://leandra.develsystems.com/cosas/error2.avi

here's a picture of the problem, When moving toward the line when it passes the line my character JUMPS

dont know how to remove that force

pls, help.........



btw: my materials between the character and floor are static and dynamic 0 and elasticity 0.

this is a bug in Newton that should be addressed in the next update.