Ricoh has released version 1.51 of the GXR firmware. This update has four documented changes, all of them addressing small issues users have reported.
But this update reminds me of another reason why Ricoh's particular modular approach with lensors (lens+sensor module) is frustrating to users: you have to update every module you own. So basically, you load an SD card with the firmware, then proceed to perform the same set of instructions for every lensor module you own. Yuck.