I started up max (max

this morning thinking I'd rig up a character I'd just finished.I set up some biped bone positioning, went to copy / paste opposite, and found that I couldn't select these options. WHY? They are there but unable to be selected.
I opened up an older character file that already had a biped setup, selected a bone, and found that with this model I could copy/paste posture etc...
If anyone has any insight it'd be much appreciated.