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I only recommended 4.0 because it is the one version that I was able to get the rss feeds to work properly on with 2.3.3. It has been a release "candidate" for quite awhile now. I have been using it on 1 production site since November of last year, and I haven't found a bug with that version of XOOPS yet. However, I have seen a few problems with 4.0 on my test sites using other versions of xoops. I had to downgrade to 3.08 on 3.4.1... On the majority of my sites I don't use cbb at all... I am still waiting and hoping for a version that works properly. Forum modules are important. They are good for everything from community to support.
However, it would appear that this issue is solved, since the forums are back up on vmaxowners's site.