>Still suspect Nikon may have made a change in the D7000 camera >software recently. Or this camera is acting strange. > >Maybe if someone try to load the latest software, they can >change ISO in flash also. That would prove there is a change.
I will say that Nikons documentation on how the flash works is a bit lacking. I have the latest firmware that was installed by Nikon when they repaired the lubricant spray defect in my camera, and as far as I can tell the unit is working the same way it always has. As already noted when in Auto-ISO you can alter the base ISO up to the preset maximum, the camera will then only raise the ISO above what you select when it determines proper exposure cannot be achieved with your selection.
Through experimentation it appears that when commander mode is active, return light not detected is the message recorded in the EXIF even though enough light was present to get a correct exposure.
It also appears that when you enable commander mode, Auto-ISO is disabled.