Additive to Setup Pose breaks feet
If you have Additive to Setup Pose checked on for feet, it causes them to pop to a different location when adding an absolute layer and entering animation mode.
Drag out a 'Base Human' preset
Check 'Additive to Setup Pose' on a foot
Add Absolute Layer
Turn on Animation Mode
Notice foot is now broken
Same thing happens if you create everything from scratch.
This worked fine with CAT in 3ds max 2009
I think I'm getting something similar. When I use the 'additive in setup' option in 2013 it straightens out the bend in the knees when going into animation mode.
Josh Jones commented
This bug occurs in 2012 and 2013.