Users complain about issues with several updates released for Microsoft Windows 7 and Windows 10 earlier this month. The affected updates are KB4034664 and KB4034679 for Windows 7 in combination with systems with 2 or more monitors.
The updates cause display issues in several applications like PDF viewer, Excel, Office 2013, Java and IrFanView and sometimes parts of the applications are not displayed or distorted. There are also reports that the desktop or another application is visible through parts of the active application. The graphical problems only occur on the second monitor, users report. Removing the updates is one way to solve the issue. However, KB4034679 is a security update and therefore other solutions (as described here) are preferred.
In case of Windows 10, the culprit is update KB4034685 for Windows 10 build 1607 (Anniversary Update) and Windows Server 2016. The update can cause the list of previously installed updates to be empty. Sometimes previously hidden updates are offered again for download and after the update is installed also additional load on WSUS servers is generated. Users report that Windows 10 PCs that are connected to a WSUS server no longer show updates after they’ve installed KB4034685,
Microsoft has stated to be investigating the issues. Users with the Windows 10 Creators Update (build 1703) installed are not affected by the issues.