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MIDI sysex message transmit fails after installing Security Update KB5077181
In the widely used MIDI application MIDI OX, I can no longer transmit MIDI sysex messages to a MIDI output port. Connecting a MIDI input in the app to a MIDI output echoes MIDI channel messages norma...
The issue you're experiencing with MIDI OX not transmitting SysEx messages after installing Security Update KB5077181 on Windows 11 Pro appears to be related to a change in how the operating system handles MIDI buffers and device access permissions. The fact that uninstalling this update restores normal functionality suggests that the update may have introduced restrictions or altered driver behaviors affecting MIDI SysEx transmission.