I again tested Forums portlet because I want to get rid of separate forum site in our webpage.
It seems that now I can actually run it and everything goes quite smootlhy - except that there seems to be serious encoding problems with scandinavian characters like ä , ö and å that blocks my plans. These characters are garbage on the screen.
I don't know what could cause this problem. Are these forums implemented with JBoss Portal Forums because you don't seem to have same problem here, and I would like to know how to get it fixed.
I use bundled 2.2.1SP2 with latest JBoss Forums and HSQLDB for portal.
This is somewhat non-forums related answer,
I am not sure if you are using hsqldb as initial database, or you intend to use it in production, but as a friendly warning - HSQLDB is not stable enough for production, consider changing it.