RyanRowland:
I logged on and browsed recent forum topics for a while, then went to refer back to an old message - and found I had a bunch of unopened messages that I wasn't aware of.
I later found by accident that when I went to my author page, it triggered just one of the new messages to pop up. Clicking on 'home' triggered another one. By going back and forth between the author page and home, and forums, I was able to get one message at a time to pop up. (Maybe other activities would have triggered them also. I didn't try everything.)
This is how it's meant to work. Basically, whenever you click on an option from the menu the site checks for waiting messages and if there are several waiting it will present the first one of them as a popup. Clicking forum posts or threads, however, won't check for waiting messages as the forum is actually not coded by me as part of the LSF software, I merely modified and integrated it with the rest of the site.
RyanRowland:
(And I miss the sexy "Excuse me... you've got messages" audio notification.)
Are you sure you haven't accidentally disabled it?