Forums Not Sending Notifications of New Topics Posted

[dalbert]

We hae approx 100 users signed up to get notifications of new topics being posted in one of our forums (a for sale forum), who are not receiving any notifications... Our test forum however (which I have followed in the same way) does send out notifications of new topics.

Issue was in 4.7.4 and I upgraded to 4.7.8, and still have the same issue. Caches cleared

Any insight on how to remedy, would be appreciated.