BUG- Lost theme, stuck w/black, select mine or new one, error message, then reverts back HELP!

SwiftKey suddenly stopped displaying with my selected theme and reverted to some random black theme.  Go to Settings->Themes->Select either my earlier-used theme or a new theme, the message appears: "Sorry that your theme changed, something went wrong on our side.  You can change it back." -- BUT-- you cannot change it back. 

Hitting "More Info" displays "We have enhanced our themes under the hood to give you a better typing experience.  Something went wrong updating your theme.  Don't worry, you can still change it back to what you had."

Selecting [Change] and any other option provides exactly zero changes.

Several problems - 1) the better typing experience is now massively worse, nearly unusable with the bogus new themes forced into the UI.  2) we CAN NOT change it back, I've tried dozens of times, both old & new themes, downloading new ones, etc.

THIS IS BROKEN AND NEEDS TO BE FIXED OR ROLLED BACK IMMEDIATELY- HOW DO WE GET THE FIX?

Disgusting incompetence and lack of QA, and it isn't like Microsoft lacks resources.