The 2001 Rig was designed before there were changes in how A:M works in Actions (v13)...it doesn't take into account the "baking" of constraints when switching from FK to IK (or IK to FK). For that reason, I would recommend either the LiteRig, 2008 Rig, TSM2 or Squetch Rig. TSM2 was also designed before the change, but I haven't heard of any problems using it (and I think Mark Skodacek made a script that would update how it works...you'd have to do a search for it).
Hope that helps, Andrew.
Hello Itsjustme,
Thanks for the feedback. Very helpfull.
But the other models seem to work ok. They also look like the 2001 rig. Has someone updated those and not the 2001 rig?
andrew