I purchased YOVI when it first came out, always had the same account and never changed deposit address, and I'm getting the same error message on the deposit screen as others have shared on this thread.
Also, have just under 2 YOVI left, once that order sells I'll have a half order to hand off and I'll have all my YOVI sold completely. Bought 43 at 2200 for 1mBTC, after the next batch is sold I'll have .2 BTC in sales. not too shabby at all.
it seems you didnt save it (as in: make a copy of the address somewhere), the screen is shown to everybody but the address generated before still works (but isnt shown)