I sent an e-mail/message asking about losing Flying Blue as a redemption option and e-Rewards' response was that I was still listed as eligible to redeem for FB and that if maybe I tried moving the award prices slider to max it would reappear. (It didn't.)

I'd suggest anyone else who lost award partners in the move to drop e-rewards a note and let them know what appears to be a technical glitch is going on for some/many users.