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  • Fix for the VB bug introduced this month released for Win10 1803

    Home Forums AskWoody blog Fix for the VB bug introduced this month released for Win10 1803

    This topic contains 14 replies, has 7 voices, and was last updated by  PKCano 2 weeks, 3 days ago.

    • Author
    • #1912741 Reply

      Da Boss

      Thanks to @wc and @ep for the heads up. A few hours ago we got KB 4512509 – the second cumulative update for Win10 version 1803 this month. It claims
      [See the full post at: Fix for the VB bug introduced this month released for Win10 1803]

      3 users thanked author for this post.
    • #1912753 Reply


      Apparently, nobody cares about the severe memory leak introduced in Window 10 1903 when running that version as client OS in Hyper-V. There are just a few months left until support for Windows 10 1803 ends. Of course, Microsoft hasn’t fixed until now.

    • #1913747 Reply

      AskWoody Plus

      I understand that the VB issue affected all versions from Win7 up yet this KB only addresses Win10 1803.  What about Win7 and Win10 1809, anyone have a clue?

    • #1913925 Reply


      the 1903 version of the VB bug fix is now available only in the Release Preview ring 8/21 – KB4512941 (build 18362.325) and thru a recent UUP dump as I checked myself

      1 user thanked author for this post.
    • #1914932 Reply


      Can anyone comment whether this Win10 1803 update is stable?

      • #1914941 Reply

        Da Boss

        KB4512501 CU released on 8/13 issues are listed on the MS pages.
        KB4512509 Preview released 8/19 issues are listed on the MS pages. It says the VB issues are fixed but still says:

        We are investigating reports that a small number of devices may startup to a black screen during the first logon after installing updates

        • #1915030 Reply


          Thanks, hoping for a first-person report from an AskWoody participant who has done a trial installation of this latest August 1803 update.   We’ll wait another few days.

          • #1915665 Reply

            Paul T
            AskWoody MVP

            Nobody here may be doing that test. Why don’t you make a backup, install the updates, test, then let us know what happened?

            cheers, Paul

    • #1923778 Reply


      Win10 1803 64bit.  WU Mgr utility update check shows MS is still offering the prior August cumulative update with VB bug.  Downloaded KB 4512509 manually from MS catalog, installed without issues, stable for 3 days.   VB apps run OK.

      • #1923808 Reply

        Da Boss

        The Security CU KB4512501 (with the VB bug) will continue to be offered through WU until another update supersedes it. That would be the Security CU issued on Sept Patch Tuesday.

        KB4512509 is a non-Security Preview. Non-Security updates do not supercede Security updates. Previews are not offered through WU unless Group Policy is set to receive them, or in some cases, the user is set to SAC(T) prior to v1903 and does “Check for updates.”

        • This reply was modified 2 weeks, 3 days ago by  PKCano.
        • #1923934 Reply

          AskWoody Lounger

          This is starting to get confusing…  on our WSUS server, KB4512501 is stated as “superseded by KB4512509” (see attached screenshot).   We have both KBs available for install for our WSUS test computers and it looks like KB4512501 is skipped and only KB4512509 is installed.  So the question now is do we or do we not have the August security updates installed?

          • #1923973 Reply

            Da Boss

            KB4512509 will contain the fixes in the earlier KB4512501 plus additional patches.

            1 user thanked author for this post.
            • #1923996 Reply

              AskWoody Lounger

              So that means it’s OK to install KB4512509 only as the update will contain both the August security updates and the additional non-security improvements?

            • #1924028 Reply

              Da Boss

              Yes, the updates are CUMULATIVE.

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