SO I just bought this thing & I was about to return it until I did a quick search to find the current status & possibility of a fix.
User crumhorn on the Ableton forums posted a set of instructions that fixed the problem for him:
https://forum.ableton.com/viewtopic....75610&start=15
I was able to fix it for myself using just one of these actions: enabling all 4 outputs in Reaper Options > Preferences > Audio > Device .