I switched from a working USB connection to Thunderbolt for my Windows 10 machine. Now, it works fine, except that the Input Status display shows only "No Lock" for all settings.

At the same time, I changed from an external input via AES, to playing from a Windows software player (Squeezelite-X) to the AES channel (second row Total Mix) and using Loopback to pass the signal to Acourate convolver, and out to Analog 1-4.

I do not know whether "No Lock" is expected when using an internal signal and loopback? Or, is there a problem with my Thunderbolt setup?

System: Win 10x64 (20H2) v.19042
Asus Z390A prime motherboard,
Processor    Intel(R) Core(TM) i7-8700K CPU @ 3.70GHz, 3696 Mhz, 6 Core(s), 12 Logical Processor(s)
RAM 32 GB
RME Thunderbolt driver 06/27/2019 v.1.16
WDM Devices AES, Analog 11+12; Same for "Speaker"
Clock source Internal or AES -- makes no difference
Totalmix 1.72
UFX+ SW version 44; Fireface UFX+: Thunderbolt 105, USB 51, DSP 44
ThunderboltEX-3 Driver Win 10x64 2020-08-25 v.1.41957.0 Util v.17.477.400
Thunderbolt 3 to 2 converter Startech
Thunderbolt cable 2 m Startech