Latest change is I have reversed the above test and the K100 is now Bluetooth paired only and USB is disconnected and the behaviour is now what I want. iCue does not need to be running and I can cycle through the profiles via the keyboard and so far the connection has not been lost.
So it appears that iCue gets confused when the keyboard has 2 different concurrent connections (Bluetooth pairing and USB cable). I guess in some way this is sort of understandable, but I do recall years ago in earlier versions of Windows it was possible to set NIC binding order where if you had multiple NICs on a computer, both connected (for redundancy, or bridging or whatever) you could specify which connection to use first and then drop back to the second (or third or ...) as necessary.
So my solution is to stick with Bluetooth and then revert to cable when I need to make profile changes, check for firmware/software upgrades, charge the battery etc.
There is a button on your keyboard on the top left with a little icon of a person. If you have the K100 it is to the left of the jog wheel. Press that and it cycles through the saved profiles on your keyboard.
