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Cant save new or existing data sources

  • I have had a few instances of Mango running for a couple of years now.
    Two running 1.12.4 and two with 1.13.0.

    Just recently I have been unable to save changes made to an existing data source or even create a new one on both 1.12.4 versions and on one of the 1.13.0 versions.

    I am not even able to activate or deactivate any either.

    There are no message in logs to give any indication of anything wrong. I have restarted the instances several times but this made no difference.

    Any help appreciated.