Well, this time I got a pop up window telling me I had a PM, but the last time, the only indicator I could see was that "Messages" in the navigation bar was a pinkish color instead of the normal tealish one, and you have to admit that a small splash of color doesn't exactly stand out with this psychedelic (but era appropriate) design theme. I also realized I signed up with an email address that I never check, so I may have had notifications that went unheeded there as well.