The cause seems to be the various driver variants and what is installed. For some this works, for some it does not.
It was then reported that uninstalling and reinstalling the printer drivers can help. BSOD: Stop code APC INDEX MISMATCH, error cause win32kfull.sys
In the meantime, Kyocera's KX Printer Driver has crystallized as being affected. In the first reports, Kyocery printers were generally mentioned as being affected, but other commercial brands and also HP devices were added. The feedback from the readership that I have cross-read ranges from "it works for me" to "now I have BlueScreens again". In the meantime, however, re-releases are being made again – as you can read from the follow-up comments to the comment linked above and other comments here. Update: Rollout halted and re-releasesīased on reader feedback, the picture crystallizes that the rollout of the initial updates was halted shortly after release (whether anything was pulled back, as mentioned here, I haven't found officially confirmed. The KB articles now list the APC_INDEX_MISMATCH error, but I haven't found any action instructions yet. Even saving PDFs and copying to Word or Excel, including pasting, triggers BlueScreens. This can lead to crashes when launching LibreOffice or when working with Microsoft Office applications. However, it is now clear that at least all Windows 10 versions that have received March 2021 updates and where certain printer drivers are installed are affected.
Next steps: We are presently investigating and will provide an update when more information is available.
Thanks to the readership for the numerous comments and also feedback (some via email). Here's a summary of some of the information – including from the comments in the post above. Meanwhile it is clear: Microsoft seems to be working on revisions of the updates, but they do not solve the problems everywhere.
I had summarized this in the blog post Windows 10 Updates KB5000802/KB5000808 causes BSOD when printing in win32kfull.sys – pulled? early. Depending on the Windows variant and environment, this ranges from not being able to print to BlueScreens when printing or calling applications from LibeOffice or Microsoft Office. With the Masecurity updates, yes there are printer issues on Windows 7 through Windows 10.