Plotter Driver Stopped Working After KB5039211/KB5039212 Updates

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Alteflynepew2

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Hello everyone,

I developed a monolithic, user-mode plotter driver supporting HP/GL 1 for my company years ago. It has worked flawlessly (recompiled and digitally signed) until two days ago when customers applied the KB5039211 (Windows 10) and KB5039212 (Windows 11) updates. Now, the HP/GL commands are missing, and there are no error messages in Event Viewer.

Could someone familiar with device driver development explain what might have happened? We have thousands of applications worldwide that depend on this software.
Thank you
 

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