PM Notifications (the email that gets sent to you saying "you have a PM") have potentially been getting shitcanned for a couple of months now when we are at peak times thanks to our webserver host not allowing us more than 500 emails per hour...
I am working on the issue with the website host, and hopefully all PM notification emails will be sent as per normal shortly...
Since fixing a forums setting yesterday, I just received 1100 PM alert "bounce" messages, argh..
Stay tuned.
Update, its going to cost us time & money to change webservers again...
All because our current webhost throttles us after we hit 500 emails per hour.
I have killed some of the subscriptions to the epic huge spam threads, but it seems we're still peaking just over 600 emails per hour at "peak" times.
So - you may not get an email notification that you have a new PM, but when you log on - you should see it pop up saying "you have a PM"
I'm working on it... Stay tuned