@rob_d I've also had no luck with the PbHUB, even when using a single unit. Switching to a PaHUB things worked as expected.
In UIFlow, if I take an ENV sensor and hook it up to a port on the PbHUB, the program just gives me an error saying the unit wasn't found (and yes, I indicated the sensor was on the hub and selected to correct port). However, take the same unit and hook it up directly, or through a PaHUB, and everything is fine. I understand the PbHUB isn't suitable for using multiple sensors of the same type, but this is happening even with just a single sensor attached to the hub.