KB5001337 has broken VB6 vertical scrollbar in Windows 10 version 1909

Question

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.

Answer 1

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 VScrollBarcontrols 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.

Answer 2

That's great news, we are still waiting to hear from our Customers but from this, I am now expecting to hear good news.

Answer 3

I installed the new patch for May on to a few of the affected systems and im being told that the issue was resolved with the new updated identified by Jeffroze.

We push to the masses tonight so ill have a better gauge of how this patch worked across the enterprise some time tomorrow. 

Thanks

Answer 4

I can confirm the same now-broken vertical scrollbar within one of apps that uses control.

Answer 5

One of our customers downloaded the preview version of the May Cumulative Update and that did not resolve the problem. They checked the release notes for the update and there had been no reference to the problem so there was no expectation that it would fix it. I don't know whether the plan is that Microsoft will fix it in a future monthly cumulative update or whether they will release a separate update specifically to fix the problem.