Win 7 64bit
Short description of error
While using Additive (non-replace) NLA layers, while Instancing Object Frames (Properties >> Object >> Instancing >> Frames)
The objects pose/animation will not keyframe/update.
It will update on most frames except new frames outside of current action's frame_range.
Exact steps for others to reproduce the error
Autokeyframe is enabled, simply cycle through the frames, moving the object around to see when it does or does not stay moved:
The success rate does not appear to be consistent. Can move the object 5 times before it updates, or have it update on the first try.