After more than one month Revive is not compatible yet with PHP 7. The mysql extension was deprecated on Jun 2013 (php 5.5.0) and you are still using it, with the consequent security and performance issues. I'm perplexed.
Exactly the same problem for me. The database entries is correctly reporting the selected preferences that was set in the previous version (OpenX 2.8), but they are totally ignored and is not possible to change them.