Forums uses permisions in an unusual way. I've seen this same problem with guest students in a dotLRN instalation if they can't read private data. Setting them as non-guest solved the problem back then.

Maybe granting the read_private_data on your forums instance to the Unregistered Visitor could do the trick.

Greetings,

Derick

Well the "read private data" setting seems to do the trick.

Only if you click on unregistred visitor, you get this error.

Forums: Posting history for Unregistered Visitor (author)
Error in include template "/usr/local/www/timedeskblog.com/openacs-5-2-2/packages/forums/lib/user/post-history-chunk": Query did not return any rows.