So I started using my account again after a couple of years and I notice that the list of game forums doesn't show any of the new games that I have bought like Diablo. To see that forum and the other new ones I have to click on "show all forums" and then I get a very large list of game forums.
It seems like my list of game specific forums is "frozen" into what it was before I came back.

I could open a support ticket for this but I there is no point doing that if this is a well known problem with an easy solution.

You have to open the full list then mark the checkbox next to the forums you want to come up - a pain to be sure... but I can't remember if any games you bought were ever automatically added... they might have been - but if they ever were it's been broken for a LOOOONG time now

Yeah, it used to update automatically with purchased games, but that was long ago. Quite sure it stopped doing that even before you went away, if it's been just a couple of years.

Ah, thank you both. Well it seems like it is more like three years since I used the site regularly. Maybe it stopped updating before that as well. Well it seems like I have some checkboxing to do! See ya!

Going through my order list it seems like they stopped automatically updating the forum list sometime in 2014.