UR44 causes Windows 10 MIDI driver to hang on SysEx DT1 message

This is a quite unexpected behavior. I have a Windows 10 app that works perfectly well when using a simple USB to MIDI adapter and also with a Roland INTEGRA-7.

However, when using my UR44 a call to SendMessage never return if the payload is a DT1 (send data) message. All channel mode messages works, and all RQ1 (request data) works fine.

It is very confusing that SendMessage can send a RQ1 message, and that the app receives a return message, but when sending a DT1 message the call never returns, and the app freezes.

Has anybody seen this behavior with UR44?


Got 2 windows updates, and now it works fine.

Hi can you show me your windows updates version (i want to make it same like you :smiley: )

Sorry for the delay, tonanto, I have not been here for a while.

These are the updates I got that could have fixed the problem:
February 12, 2019—KB4483452 Cumulative Update for .NET Framework 3.5 and 4.7.2 for Windows 10, version 1809 and Windows Server 2019