Ephorus problem in Blackboard

This week (August 10) we discovered that Ephorus plagiarism reports do not appear for documents that are uploaded after the Blackboard upgrade on August 2. The documents keep showing 'checking...'. Since Monday we are investigating this but the cause has not been found yet. It is improbable that it is caused by the new Blackboard version because we tested this functionality before on a test environment and the problem does not occur there.