[JohnBee]

I found a small typo:

######
#Find#
######
			SELECT $previewfield
				thread.threadid, thread.threadid AS postid, thread.title AS threadtitle, thread.iconid AS threadiconid,
				thread.replycount, IF(thread.views=0, thread.replycount+1, thread.views) as views, thread.sticky,
				thread.pollid, thread.open, thread.lastpost AS postdateline,
				thread.lastpost, thread.lastposter, thread.attach, thread.postusername, thread.forumid,
#################
#Add right after#
#################

thread.threaddesc

Insated of: thread.threaddesc
it should be thread.threaddesc,

Otherwise you'll get db errors.