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I have the latest version of eaccelerator installed (phpinfo is confirming this), but:

vB Optimise: You have selected a cache method that vB Optimise has detected you cannot use, this may be because the extension required is either not installed or active on your server.

When I turn on vB Optimise with Filecache, forum homepage is showing:

Database error in vBulletin 3.7.4:

Invalid SQL:

		SELECT
			user.username, (user.options & 512) AS invisible, user.usergroupid,
			session.userid, session.inforum, session.lastactivity, session.useragent,
			IF(displaygroupid=0, user.usergroupid, displaygroupid) AS displaygroupid
		FROM vb3_session AS session
		LEFT JOIN vb3_user AS user ON(user.userid = session.userid)
		WHERE session.lastactivity >;

MySQL Error   : You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '' at line 7
Error Number  : 1064
Request Date  : Wednesday, February 11th 2009 @ 08:17:55 AM
Error Date    : Wednesday, February 11th 2009 @ 08:17:56 AM
Script        : ...
Referrer      : ...
IP Address    : ...
Username      : ...
Classname     : vB_Database
MySQL Version : 5.0.51a

Any help would be much appreciated!