The signature issues are resolved. (Any school that still sees issues with that particular error can solve it by shutting off signatures at the pad or account-wide. Please contact Clover support for additional help with this issue.)
Clover is still evaluating the issue with finalization, and will have a solution going forward. For now, Clover can add any stores with finalization issues to a holdback group that will keep the store from installing the version with issues. Clover has done this for every store who has reported the issue. We will continue to use this work-around until Clover has tested and deployed a long-term fix.