So here's what happens -
When I have multiple instances of Serum running in Ableton Live, I play a clip and can hear audio (doesn't seem to matter which clips are playing). As soon as I stop the clips, audio stops coming through altogether. The level meters will still act as normal when I play clips again, just no audio. This problem is temporarily solved by going into preferences under the audio and changing the buffer size (doesn't seem to matter what I change it to), and if I delete all but one instance of serum before playing again then everything works just fine. Add in a second instance again and the same problem comes back. It also doesn't matter whether I use Serum as a VST or AU.
Any ideas on how to solve this issue?