you should back your tiny from 6.1.4 - because some features on your site won't work with old tiny.
And to solve problem in Orca with new line you need
in
/orca/layout/uni/css/main.css add

p
{
margin:6px 0 6px 0;
padding:0 0 0 0;
}

.tbl_p_msg p { padding:6px 0; }

This should help to add Double Spacing into Orca forum

Regards
Artur