I'm totally baffled here - I'm hoping someone can help me.
I've been making some changes to my Default template today, and I've noticed that just my two reverb return tracks are not working properly anymore.
I'll send audio using my Send A and Send B knobs on a channel, and nothing will register in the metering on the corresponding Return channels. After turning various devices on and off in each FX channel, it is the actual (Ableton) Reverb on each channel that seems to be preventing the signal from progresing.
(signal registers on the meter when Reverbs are turned off)
Thing is, I'm sure I didn't change anything in my return channels today - and my other return channels ( 3 x delays, 1 x exciter) work fine.