I tried your PRJ and I get a odd result also.
Wait a few days for v15h to come out. I put in an AMReport on Paste Mirror a while ago and I believe Steffen has addressed it in the next release.
Steffen explained to me that in rigs like TSM2 and 2008 apparently, the CPM algorithm can get confused by hidden rig bones that are in nearly same positions as control bones. Notice that bones like Chest Controller
Parent are getting keyed by CPM even though those weren't keyed to begin with and shouldn't be getting a mirror treatment.
Wait a few days for v15h to come out. Sorry for the frustration.
QUOTE(cribbidaj @ Nov 10 2009, 12:20 PM)

I don't know where the 'translate, scale, rotate, other etc' keys are. The choices I have are 'model, branch, bone'.
'
to the left of those. hover over them and they have names.
BTW, have you watched my keyframing options vid inthetuts link in my sig? It covers that stuff.