Mega Messenger Post Adder

Sometimes the post friend adder works for a bit. If there are a lot of people who hearted a post, when the list hasn't full loaded all the engagers (it does it as you scroll), it only seems to do those that are loaded, and doesn't automatically scroll, it seems (it stops adding)? I prove this by manually starting it again having scrolled, and it starts up again.

I suspect that the above problem could be due to either timing out of session, or FB blocking of limiting me possibly. Because it sometimes works...

I haven't figured out when it happens but after a time, it starts saying getting facebook id, and pops up a blank window (that could well be to do with a session timeout, perhaps?)