Hi,
A few answers:
- The path tracer is production ready. But substrate isn’t. It is beta for 5.5. Path tracer should be in a good state with Substrate for 5.5 but there might still be differences (and there will always be due to its nature). This is a work in progress with no ETA.
- Substrate crash: not sure about this one. Ig you have a project to share it would be good (I see a download icon in our post but not link available @Ingvard )
- The flashy light you see is due to VRS, we are actively working on a fix for 5.5.