A bit more of an update on mine.
I've found that if I have the software loading on startup (whether through registry or a shortcut in the startup folder) the app loads but the default profile in software isn't loaded. If I close down the app and reopen it, it does load the profile.
If it doesn't load on startup, starting the app manually with same parameter (so it just has icon in the task bar) also loads the default profile.
I suspect there is a clash on windows startup, probably with USB3 drivers or something.
An oddity with bios mode though. Worked fine previously and was able to negotiate menus etc. Been doing some work on profiles (device profile is still currently "all lights off") etc for the testing. Don't know if it's related, but since then when in bios the up arrow key doesn't work (but down, left and right are fine).
I initially turned num lock off and used the keypad arrows which all worked - but now num lock doesn't work, so can't do that either...
Everything is fine in windows - so it's almost like the bios mode key map has got messed up. Tried the switch on the back in BIOS mode, and it makes no difference - just has the light to the left of the mute button flashing all the time, not just when booting/in bios.
May try seeing if there is a reset to defaults option and see if that fixes it, as it could possibly be a software bug when writing profile to keyboard?