Ableton Live 11 (Trial) blocking OBS?

[tehlord]

Has anybody had issues with Live 11 (specifically the trial version) blocking audio from going into OBS?

My setup in W10 PC running an RME UFX2, I have DAW and mic audio routed on separate loopback channels in RME Totalmix, and have been using this setup for years to record video tutorials.

The individual channels are routed into OBS, one for mic and the DAW channel as a separate aux.
This has worked fine up until installing Live 11 Trial. When I run the trial, OBS cannot see ANY audio from my computer, my mic or from the DAW loopback channel in OBS.

What's more odd is that I have to run Live 10 again to get it working. Even if I shut down Live 11, OBS still cannot see any audio at all until I re-run Live 10.

I've been onto Ableton support but got no joy there, but I can't help feeling Live 11 is doing something to the audio that I can't figure out. I'm wondering if this issue is specific to the trial version, and if the issue will be fixed when I actually upgrade.

This is not a Windows permission issue as far as I can tell.