Ordering Group discussions by latest active
Using Jamroom
I don't get this. Have just checked your index.tpl and you do have this jrCore_list code for activities -
{jrCore_list module="jrAction" search1="action_module != jrFollower" search2="action_module != jrComment" order_by="_item_id numerical_desc" template="index_activity.tpl" pagebreak=50 page=$_post.p}
which means that no follower or comment activities will show. Have just tested this on your site and that is the case. Yet you say that before I added in the module to update the _updated field on comments, you were seeing group discussion comments?
Am going to temporarily disable this new module and check it again.