Adding Vertical force, stops two other

[mariant]

Someone knows why when i add vertical force, longitudinal and lateral forces stop working?, i have my simulator almost done, but this is going me crazy.
i will apreciate your help guys.

[prodigy]

When you're addding force, be sure that you check 'add result value' in force window instead of 'overwrite result value'. Change that for every force and try.