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Actually, if you have subforums it doesn't work even after you make a post. On top of that, CBB 4.0 doesn't work at all with XOOPS 2.0.18.1. At least not on my servers.
I have never had anything but problems with CBB since it became "cbb."
You would think a reliable, simple forum would be an easy module to develop. I still use xhnewbb on some of my sites. It works on every version of Xoops. In order to get feeds you have to install a separate module like "What's New" or something, but that's no big deal.
However, on the sites I use CBB the feeds are messed up and I have found no solution. It's been 3 years or more of CBB sucking, so I'm used to it.
Magick can never be restrained, but when freely given is thrice regained!