I am not able to reproduce this issue with Batch validate in Production Mapping 10 SP1, I request you to please confirm the following:
1. Is the batch job created in Production Mapping 10 SP1?
2. What are the checks present in batch job?
3. What happened if you create a sample batch job with just one check and compare the result with the similar check in single mode?
4. Are you using the "Always Execute" option available in the Reviewer Session Manager?
5. Is this issue reproducible with sample data?
Regards,
Kumar