I have having this issue with 9.1.1 as well. We upgraded to 9.1.1, just before 9.1.2 came out. Upgraded from 8.2.5. Getting the same message, "Failed to load source for Statistics Table visualization".
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Disregard, managed it. We use AD (ldap) for authentication, so I just setup the local admin user with permissions for can_schedulepdf, and I just use that local account to schedule. The AD account was limited to only roles defined, so using an local account to provide the service.
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