for me, I can't tell if I have PM, in fact, If I have 0 PM, I have the "Inbox (0)"
If I have one, I see:"Inbox (System.Web.UI.WebControls.Literal)"
I guess System.Web.UI.WebControls.Literal don't mean 1 in any language, so, I think it is a bug
And that is why you shall respect the bug reports guidelines, not only giving a capx is making the bug reproductible in one click in a situation they can work with (less time wasted trying to reproduce vague instructions) but also it helps filtering false positives.
Game design is all about decomposing the core of your game so it becomes simple instructions.