I was looking at my PMs and I noticed that quite a few of them only had my username as a participant, even if the person I PMed responded to me.  What's stranger is there are also ones where the person is shown as a participant but others not.  It's not the biggest of bugs to be sure, but for like PMs I sent to someone and they never responded back, since the participant doesn't show up how am I even suppose to know if it got sent to them?  Anyway this is very strange and should be looked into.