Two of this month’s Win7 patches causing second-screen problems

August 14, 2017 brianradio2016

We now have solid reports of a bug in both of the Windows 7 security patches for this month, KB 4034664 (the monthly rollup, installed by Windows Automatic Update) and KB 4034679 (the manual security-only patch). If you have a Win7 machine with two or more monitors, and there’s something weird happening with the second monitor, you may be able to solve the problem by uninstalling the bad patch.

I first read about the problems last Saturday on Günter Born’s Born City blog. He documented bugs in the second-screen display of PDFs using PDF-Xchange Viewer, problems with the second screen in IrfanView, Adobe Reader, Excel VBA, MathLab, ACDSee, some Java applications, and Office 2013 garbling window titles, scrollbars, and other screen elements.

This morning there’s a detailed analysis from Christian “NineBerry” Schwarz on his Wolfsbeeren blog:

In applications, graphics or controls are not shown or shown distorted. You might for example only see an empty background with missing foreground graphics or missing controls. Or you see the Desktop or parts of a different application in parts of the currently active application.

These graphical problems only appear on secondary monitors, not on the main monitor and possibly also depending on the position of the application window within the secondary monitor.

Schwarz offers these workarounds: