It's not a problem of HUD not showing but a problem of counting winnings on session summary.
Maybe I'm wrong, but I think PMU is part of PartyPoker, not Ipoker (or is it the same ?).
Anyway, my H2N is up to date (22.214.171.124) and still shows -€1 when I finish in 1-3 place in a PMU's Double or Nothing, displaying place 0 as a result...
I hope you can do something about it.