in maya 6, i beleive u have to first select the character u created,
then in the trax editor click on a little "`+` icon with a stick character next to it"
then i think it will load your character.
fyi, in the clips options, u can choose to send the clips to the visor or trax or both (it' s like that in all maya versions)
choose both if u want it to automatically load the clips in the trax...