Microsoft breaks WPF printing with .NET update
Summer in Redmond, Winter for everyone else
Microsoft's August 2026 .NET Framework update has reportedly caused printing issues for some users. According to Microsoft, certain versions of the WPF (Windows Presentation Foundation) applications may fail to print or generate PDF/XPS content with specific fonts, such as Calibri. This issue arises after installing the August 11 cumulative update for .NET Framework, which is designed to fix various problems across Windows 10, Windows 11, and Windows Server 2012 to 2025.
Microsoft has suggested a workaround in the app config file to disable certain protections, but warns that doing so may expose the system to the vulnerabilities addressed by the update. Microsoft advises using this workaround only as a temporary solution when necessary. The company is still investigating the root cause of the problem, which seems to be related to how the update processes fonts during XPS/PDF content generation.
This latest update follows a similar incident in August, where a security update for Windows reportedly broke several games due to issues with peripherals or RGB lighting features.
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