Hi @Paul-Mason @CCarreiras ,
let us try to figure it out. Can you check first this link when youre logged in? This brings you to your profile´s settings for the notifications; just to validate they are turned on accordingly for the topics & replies level.

Then can you check on the Inventor Forum´s drop down if the subscription is set for you? If above is correct and you dont receive topic level notifications than we need to see the subscription is in place for this forum.

If you are subscribed it should say 'unsubscribe' instead of subscribe. If you are not subscribed, subscribing again should solve that.
Note: as you might know or not know, we did a huge migration effort on the community in the past weeks; where all content was moved to new boards (backend wise). You should have automatically after been subscribed to the newly created boards where the content was migrating to. If you discover that you are not subscribed to the inventor forum this might be a reason in this case, even if it shouldnt be a case as we reenabled all the subscribtions for everyone on the new boards. Better double checking and mentioning though.
Let me know if above steps are helpful, what you see and if it is working again as it should for you after that!
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Tarek Khodr
Community Manager