This happened to me on 4-23, private message notifications, I'm not a huge PM'er so i didn't know what was going on or why it was happening, only one message that it happened with and it came through my inbox (regular email, saying there was a new PM for me here at Mothering) 4 times I think. I did not get any other PM's that day. Did have one on the 24th and the notification came through only 1 time.
don't know how this might relate to anything but those who understand computers might be able to figure out things better if they have more info...
When I typically get a PM I get a notification in my regular email saying that I got one at mothering. When I open mothering up (have it bookmarked to the forum homepage in my favorites) if I have a PM i get a window and it says something about alert you have a new PM would you like to open/see/read it now and the option of yes and cancel, if I choose cancel i can go on with looking around mothering, if I choose yes then I always get a bling on my speaker and up top under my tab area of windows I get something about my computer settings saying that I don't allow pop ups or something or other (I guess that has to do with my security type settings) The only way that I can look at the PM (without changing things in my computer settings) is to click on private messages and go from there, I can never read them from that pop up window thingy by choosing yes.
When I got the alert that I had a PM I did not go read it immediately, I was rushed on time and just went where I was originally going on Mothering and ignored the PM until later, my thought was that because I ignored that alert that the system resent me the notification to my email inbox. Wasn't a big deal to me because like I said it only got the notification 4 times and I don't get very many PM's. I also have Mothering settings set up so that I can see what threads I'm subscribed to while at Mothering but I do not get alerts sent to email that someone has posted new on those threads.