I still have not tracked down the exact root of the problem, but I have come up with a partial fix. I say partial because it only works if "Use Limits" is turned off in the figure menu.

The first difference that struck me between my copies of Jessy, JessiCasual, and my copy JessiHiRes, was that JessiHiRes had the limits forced on some of the channels in the hands and fingers. I made a pose to unforce the limits on all the rotation, grasp, and targetGeom channels in the hands and fingers. This solved the problem for me, but only if "Use Limits" was also turned off in the figure menu.

I assume that the real root of the problem is that some of the limits are set at inappropriate values on the left side, but I have not found the motivation to check the limits on each individual channel. With 36 channels to check in each hand (this includes some targetGeom channels linked to rotations via ERC), perhaps I can be forgiven for not wading through them individually.

With the attached pose file, you will need to loose the ".TXT" part of the file extension before you can use it.