While this won’t affect the majority of our users, for those diving rebreathers with connected dive computers that measure and report pO2 during the dive (e.g. Shearwater Predator and Petrel): there is a bug in the way we store the pO2 in our data files. This bug causes us to corrupt some of the pO2 values in our data file; this often creates odd spikes in the pO2 graph.
A version 3.0.2 that fixes that should be out within the next day or two -- the goal is that users affected simply need to re-download their dives from their dive computer with that updated version of Subsurface; that should correct the problem without any data loss. We still need to do some more testing to make sure that does indeed work as intended.