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I had the problem with posting on my local testing site, which I think also returned the "Array( )" problem when debuging the forum, and when I turned on the portal debuging I found that there was an SQL error, and that there was a column in the table that he couldn't find.
I think it was "poster_ip" in "xoops_bb_posts".
Then I noticed that the ip info for all posts when browsing the forum was 0.0.0.0.
I renamed it and then it worked... I really don't know how that happened.
I tested with XOOPS 2.3.2b, php 5.1.1, MySQL 5.0.15 and I think I have apache 2.2.6.
I upgraded from 3.08 to 4.0 rc
hope this helps...
otherwise I think it works well as far as I tested localy, though I didn't want to risk on the comunity site...