KB5001337 has broken VB6 vertical scrollbar in Windows 10 version 1909

Since KB5001337 was applied to Windows 10 version 1909, the vertical scrollbar in our VB6 application now shows as a white box instead and no events are actioned from the vertical scrollbar meaning that scrolling is now disabled on all screens that use this control.

Later versions of windows 10 have not had this update and they are all working ok.

If the update is removed then the functionality starts working again.

Is there anything our customers on this version of Windows can do apart from updating to a later version of windows.

They are all on the enterprise version of windows so will still be in service for this version of windows for the foreseeable future and they did not have any plans to immediately update their version of windows and they have a vast estate to maintain so it will give them a problem to either keep the update rolled back or to upgrade to a new version of windows.


May 11, 2021—KB5003169 (OS Build 18363.1556) (microsoft.com) appears to have fixed the issue.  

  • Addresses an issue that might cause scroll bar controls to appear blank on the screen and not function. This issue affects 32-bit applications running on 64-bit Windows 10 (WOW64) that create scroll bars using a superclass of the USER32.DLL SCROLLBAR window class. This issue also affects HScrollBar and VScrollBar controls and classes derived from System.Windows.Forms.ScrollBar. A memory usage increase of up to 4 GB might occur in 64-bit applications when you create a scroll bar control.

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Question Info

Last updated September 9, 2021 Views 3,283 Applies to: