Have notice that state (Indiana) return filing rejected due to a data mismatch from W2 import. Cannot open up that data online for the state. What to do?

This appears to be a more widespread issue. It looks like several people are on the forums now complaining about this exact issue.

The state income is from your w2 entry in the federal section. You should delete the imported state wages and type them in manually. If you continue to have a problem,  contact support.