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Two weeks ago, I talked about a bug in Windows 7’s August Monthly patch rollup KB 4034664 that left many people who have two monitors reeling. After installing the security patch, the first monitor would work properly, but the second monitor could have all sorts of rendering problems.
Günter Born had a full writeup about the problem, and Christian Schwarz not only nailed the problem, but he wrote a “proof of concept” program demonstrating what was happening and when.
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