Re: Comment loop gone when using /category/ permalink
That\’s better. Looking around.
EDIT: I took a look at that trac ticket and it specifically mentions changing the permalink structure to /%category%/ and that RC1 has problems loading the proper templates. It looks to me like that is what is happening in your case. It\’s like the comments.php template isn\’t being loaded. I\’m not finding any html structure from that template under your blog posts. No template no structure. https://trac.buddypress.org/ticket/554
The only solution I can suggest to you is change the permalink structure back or install the trunk version of bp. Installing the trunk version means upgrading wpmu to the svn branch of 2.7, deleting bp from /mu-plugins and moving it to the new location in /plugins.