The mod isn't broken- I have been using it for years without issue. I think you just don't have it setup correctly.
When you specify a master for like 2|x,y,z the forum itself, 2, must be after the | as well so it would be 2|2,x,y,z in most cases.
Here is a screenshot from my own setup-
The master forumid (red arrow) is also repeated after the | character (yellow arrow) - it doesn't have to be immediately after the | but it's easiest to keep track of if you put it there.