I have had this problem for a long time as well -- and it makes it so I cannot use Totalmix Remote.
For the record:
I am running on MacOS 14.5 on a 2021 M1 MacBook Pro.
I am running on a Fireface UFX III on which I just updated both the RME Driver and Firmware
What Works:
Hardware Output faders work flawlessly.
Both Mute and Solo buttons work on both Hardware Inputs and Software Playback.
All faders and Pan Knob work ONLY on the Hardware Outputs row.
All Snapshots and Layout preset controls work.
All Groups enable/disable buttons work.
I've tried disabling the firewall on the Mac -- no change
What Does Not Work:
None of the faders or Pan Knobs on the Hardware Inputs and Software Playback sync with TotalMix on the Mac.
None of the View Options sync with Totalmix on the Mac.
DURECorder does not sync with Totalmix on the Mac.
Totalmix Remote has been useless since the first day I tried it (two years ago on a Fireface UFX II+, and recently on a Fireface UFX III)
It does not appear to be a firewall issue. Please help. Thanks.