Although save of session and/or .sr files never completes (bug just filed), a .pvs and .sr are created and these can be read by the program. Unfortunately, the screen layout from original capture is not preserved (rows appear in random order) and the protocol decoder (parallel in this case) is duplicated on screen.
IMHO this is a rather serious problem. Am I the only person seeing it? Tried both Linux and Windows (32-bit) Pulseview and neither retains signal ordering or grouping. Worse, each round adds one or more additional parallel decoders. At one point I ended up with dozens that I was unable to delete!