Is that bbpress 2.0 RC1? I’ve had two subscriber users post in two different closed topics on my install at http://www.politepix.com/forums/openears
I just put some additional checks into branch. See if that fixes it for you.
Thank you John, I installed branch and it now excludes subscribers from posting in a closed topic.
BTW, every time I install a new version I need to change the permissions on bbpress/bbp-themes/bbp-twentyten/css/bbpress.css from 600 to 644 after FTPing it up or I have no styles in my forum, maybe a bug or maybe my FTP client but I don’t usually have issues with permissions after uploading.
More info: splitting half works in this version. You can first create a new topic manually in the forum, and then split replies into that existing topic. But, if you go with the option to create a new topic purely in the split dialog, that fails and the reply that you clicked “split” for disappears. The new topic you created can be seen in PHPMyAdmin but it isn’t visible in the forum anywhere.