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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.
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