From DSDPlus -h output:
Decoder options:
-r1 role is single-receiver control/rest/traffic channel decoder [-r1]
-rc role is dedicated control/rest channel decoder
-rv role is dedicated voice channel decoder
-rp role is passive digital decoder
Looks like the default role is now 1R / single receiver, and that requires a TCP connection.
If you're using a WaveIn audio source (line/mic in, virtual cable), pick a different role.
Which file to I have to edit to change the 1R back to -r1 ? Will this fix FMP24 also? I just updated and nothing is working.