@pinkishhue: I’m using Weaver Xtreme Theme.
@Robkk: The custom titles in AIO SEO are all set to %page_title% | %blog_title%
There are none of the forum related options you said to check. (Maybe in pro version)
The forum is displayed via shortcode on a standard page.
When I remove the forum shortcode the title is displayed correctly. Adding the forum to the page removes the title.
Sorry for replying to this old stuff, but I have nearly the same problem.
When I use the bbPress slug /forum the page title becomes empty, only “Forum |” is displayed.
When I change the slug of the forums page the title is correct.
Please see the effect on the two identical pages:
Using bbPress slug – Title missing
Using custom slug – Title displayed
The forum is visible only for logged in users but you can see the effect in the page title.
Thanks
Chris