Several times I have tried to save a very long flight while within Oceanic air space, either default Atlantic or user created and PF3 has failed to pick-up where it left off. I can hear passing tfc but my co-pilot makes no position reports at waypoints and of course no SELCAL activity. Admittedly, I normally just give-up and revert to P3Dv4.5 atc. But now since you stated that you are looking into Oceanic problems I figured I might as well join the conversation.
I listen to RW HF aviation comms all the time, e.g. New York radio, Oakland, SF Radio, Gander, Shanwick etc... One of the reasons I bought PF3 was for its Oceanic capability. That is not a complaint... actually I love PF3 and think the program is Genius! I want to see it get better.
Also for your consideration: ATC does not SELCAL the receiver every time they want to talk to them after the initial SELCAL (after the receiver is "woke-up") or once the aircraft contacts ATC for a position report or other reason. The receiver has a programmable "time-out" after which it goes back to 'sleep' and has to be 'woke-up' with a SELCAL again. (anyway, the radios I used had that feature ... that was a while ago though)
A typical exchange (at least what I have heard on HF on freqs operated by Rockwell-Collins GlobalLink Services:
1) "United 943 position report"
2) "United 943 go ahead with position report"
3) {United 943 gives current position, next waypoint at time, fuel remaining and its SELCAL code}
4) {ATC reads back and says 'Standby for SELCAL check'}
5) ATC activates SELCAL
6) United 943 confirms SELCAL received.
END
Also, ATC will SELCAL an aircraft that they have a message for them; to advise of impending WX, other aircraft etc...
We are patient and willing to wait for improvements to the system. Thank you for caring about it.
Walter