هذه هي المشكلة...
Database error in vBulletin 3.7.2:
Invalid SQL:
		SELECT 
			IF(votenum >= 1, votenum, 0) AS votenum,
			IF(votenum >= 1 AND votenum > 0, votetotal / votenum, 0) AS voteavg,
		 post.pagetext AS preview,
			thread.threadid, thread.title AS threadtitle, thread.forumid, pollid, open, postusername, postuserid, thread.iconid AS threadiconid,
			thread.dateline, notes, thread.visible, sticky, votetotal, thread.attach, thread.lastpost, thread.lastposter, thread.lastpostid, replycount, IF(views<=replycount, replycount+1, views) AS views,
			thread.prefixid, thread.taglist, hiddencount, deletedcount
			, NOT ISNULL(subscribethread.subscribethreadid) AS issubscribed
			, deletionlog.userid AS del_userid, deletionlog.username AS del_username, deletionlog.reason AS del_reason
			
			, threadredirect.expires
			
		FROM thread AS thread
			LEFT JOIN deletionlog AS deletionlog ON(thread.threadid = deletionlog.primaryid AND deletionlog.type = 'thread')
			 LEFT JOIN subscribethread AS subscribethread ON(subscribethread.threadid = thread.threadid AND subscribethread.userid = 4 AND canview = 1)
			
			LEFT JOIN post AS post ON(post.postid = thread.firstpostid)
			
			LEFT JOIN threadredirect AS threadredirect ON(thread.open = 10 AND thread.threadid = threadredirect.threadid)
			
		WHERE thread.threadid IN (0,4146,4147,4145,4144,4143,4142,4141,4132,4126,40  90,4114,4112,4091,4089,4040,4042,4015,3987,3977,39  91,2205,1122) 
		ORDER BY sticky DESC, lastpost DESC;
MySQL Error   : Column 'canview' in on clause is ambiguous
Error Number  : 1052
Request Date  : Friday, July 11th 2008 @ 11:26:40 PM
Error Date    : Friday, July 11th 2008 @ 11:26:40 PM
Script        : 
http://www.smd-sh.com/vb11/forumdisplay.php?f=21
Referrer      : 
http://www.smd-sh.com/vb11/index.php
Username      : ؟؟؟!
Classname     : vb_database
MySQL Version : 4.1.22-standard-log