I found that initially no conference rooms were listed. After a client had (successfully) connected to previously cached conference rooms, they became listed in the web based ui. possibly a bug, possibly a result of my upgradenot being ‘perfect’, I just swapped the 3.5.0 config file and started with the new version and tried my luck, so far so good.
I have noticed this behaviour too. I attempted to figure out why this is happening, but did not find anything…
I have created a Jira ticket to track this issue: JM-1415
Are you still noticing this issue with recent versions of Openfire? I am not seeing it anymore, so was just curious.