Hmm seem to remember that i forgot to include postbit_legacy support in this version.
Try edit the 'Replace Report Button in Postbit for PM' plugin.
Find:
PHP Code:
mh_pmwb_modify_template(&$this->registry->templatecache, 'mh_pmwbrp', 'postbit', 'report_button'
, 'href=\"report.php?" . $GLOBALS[\'vbulletin\']->session->vars[\'sessionurl\'] . "p=$post[postid]\"'
, 'href=\"mh_pmwbrp_report.php?" . $GLOBALS[\'vbulletin\']->session->vars[\'sessionurl\'] . "do=reportpm&pmid=$post[pmid]\"');
and replace by:
PHP Code:
mh_pmwb_modify_template(&$this->registry->templatecache, 'mh_pmwbrp', 'postbit_legacy', 'report_button'
, 'href=\"report.php?" . $GLOBALS[\'vbulletin\']->session->vars[\'sessionurl\'] . "p=$post[postid]\"'
, 'href=\"mh_pmwbrp_report.php?" . $GLOBALS[\'vbulletin\']->session->vars[\'sessionurl\'] . "do=reportpm&pmid=$post[pmid]\"');