Just got a new ur44c. Dspmix gives device not found, downloaded latest version , uninstalled, rebooted etc. same error.
On the pc i tried 3 different ports, two 3.1 gen2, and a 2.0, using high quality usbc cable.
On the laptop, only the driver itself wants to install, was already on there by the way for the ur22 I sometimes use there, but control panel for the card now keeps complaining about usb 2 while its two usb 3.2 gen1 ports. On the laptop the suite with dspMixFx won’t even install, probably because it doesn’t see the thing, while regular audio does it there too.
With the previous ur44 without c I had something similar but that was because while playing the plug got out of the power supply, after that the thing started acting weird and also gave among other things this error message. That turned out to be hardware, all vm’s and dual boot suffered from it.
Finally borrowed a ur22, no more weird quirks (like no sound with certain codecs), but it doesn’t have that mixer.
Win10 pro latest updates.
The previous u244 (without c) mixer worked for years.