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Have you done any design changes in the Change Process or Object recently ?
The only time I have seen this error is when there has been design changes and the cache has not been updated.
If you have made changes have you tried doing a recycle of the application pool and a restart of the outbound service.
This is now resolved and Paul was correct.
Having looked further into the application server we found that it was falsely recording that the system had been restarted. A manual reboot of the app server solved the issue.