FOUND A POSSIBLE FIX! But am I ever ticked off now! I found this fix for the annoying gallery sign-in request:
Android: Disable Syncing of Picasa Web Albums to Gallery App | a Tech-Recipes Tutorial
So, I go into my settings to follow the instructions and to my very UNPLEASANT surprise I find that KitKat reset ALL my sync settings (which I had turned OFF!!!) to ON!!!!!!!!! Every freaking one of them were set to sync.
I have more than a few choice words for Google right now!!!!!!!! but these are the only ones I can think of at the moment that I can say on a forum board ... how freaking DARE they!!!!!!! I turn these things off for a reason they have NO RIGHT to turn them back on!!!!!! When privacy invasion things like this happen I just want to scream "I want my BlackBerry back!"
I did follow the instructions for the fix a few minutes ago (and turned off everything from syncing!) so it's too soon to tell if it got rid of that sign-in thing.
Hope this helps.