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Dash Fatal error when start to load Steam VR games; used to work fine until recently.

Honored Guest

While used to work fine, now get a DASH fatal error message every time I start to load a Steam VR game. Oculus games on PC work fine. When connect the Quest 2 and cable to an older PC, Steam VR games run fine.
Implies something in the PC is now causing this failure to load Steam VR games. Primary interest is MSFS2020 but other Steam VR games get the same DASH fatal error result.