I managed to replicate the unresponsive keyboard issue. I hope the logacat got it. I'm on the latest aokp rom using stock cm9 rc1 SMS because it has the ability to enter a new line. I hope it helps.
Does anyone know how to take a screenshot with the new 4.4 CyanogenMod ROM? If I missed it i apologize in advance but all the old ways aren't working.
Power + volume down is working for me
Its only a radio update. I don't see how it could possibly be anything bad.
I looked all through the settings but I can't find the "back button to kill process" option, is it present in this ROM?
you can try setting it on nav bar settings
Have you uninstalled any drivers? Download and install the drivers from the bible thread if you haven't. Like suggested, try different USB ports and different USB cables. Sometimes it takes more than one try for some reason.