[Eq4bits]

Fixed mine by changing

$previewfield thread.threadid, IF(thread.threadprefix <> '', CONCAT('" . $vbulletin->options['prefixmarkup_start'] . "', thread.threadprefix, '" . $vbulletin->options['prefixmarkup_end'] . "', thread.title), thread.title) AS title AS threadtitle, forumid, pollid, open, replycount, postusername,
				$lastpost_info, postuserid, thread.dateline, views, thread.iconid AS threadiconid, notes, thread.visible, thread.attach
				" . ($vbulletin->options['threadmarking'] ? ", threadread.readtime AS threadread" : '') . "
				$hook_query_fields

to

$previewfield thread.threadid, IF(thread.threadprefix <> '', CONCAT('" . $vbulletin->options['prefixmarkup_start'] . "', thread.threadprefix, '" . $vbulletin->options['prefixmarkup_end'] . "', thread.title), thread.title) AS threadtitle, forumid, pollid, open, replycount, postusername,
				$lastpost_info, postuserid, thread.dateline, views, thread.iconid AS threadiconid, notes, thread.visible, thread.attach
				" . ($vbulletin->options['threadmarking'] ? ", threadread.readtime AS threadread" : '') . "
				$hook_query_fields

(just took out the 'AS title' before the 'AS threadtitle')

not sure it that was all that was affecting subscriptions or not, there was also a problem with instant email notifications not being received but was only tackling one problem at a time. waiting to hear back from members as to whether that also cleared up with the above fix.