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    Join Date
    Oct 2005
    Mesa, AZ

    Default Urgent Action: Prevent Database Problems from Windows Update KB4556799

    We just did a mass mailing to all customers on this. If you haven't seen it, please have a look now.

    ALERT: ACP Scheduler and Windows 10 Update KB4556799

    It affects Windows 10 1903 and 1909. This "just started happening" in mid May, when the KB4556799 Windows Update was released. If you encounter an error saying the Scheduler database is not in a recognized format e.g. Cannot open database. It may not be a database that your application recognizes or the file may be corrupt, and you see that the file SchedulerData.mdb (in Program Files (x86)\ACP Scheduler) is like 2Gb, here's how to recover:

    How to Recover:

    Run the
    JETCOMP utility located in the Scheduler (8.3) install folder under Program Files (also attached if you are on an older Scheduler version, it has been confirmed to be happening with earlier versions). Details are in the Scheduler 8.3 Help under Advanced Features (sorry about the giant font in the warning). Be patient it may take many minutes:

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    How to Prevent Future Problems

    Simple - Uninstall the Windows Update KB4556799, and never let it install again. Ignore it if you see it in Windows Update. We'll keep you updated in subsequent posts on this thread.
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    Last edited by Bob Denny; May 20, 2020 at 23:42. Reason: We know what's happening now.
    -- Bob



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