Can't create table taggregate_temp
 

Hi,
Since last 2 days, I am getting these db related errors:
Code:
Database error in vBulletin 3.8.0:

Invalid SQL:

CREATE TABLE IF NOT EXISTS taggregate_temp_1243763760 (
threadid INT UNSIGNED NOT NULL DEFAULT '0',
views INT UNSIGNED NOT NULL DEFAULT '0',
KEY threadid (threadid)
) ENGINE = MEMORY;

MySQL Error : Error writing file './mysite_com_mydb/taggregate_temp_1243763760.frm' (Errcode: 28)
Error Number : 3
Request Date : Sunday, May 31st 2009 @ 09:55:16 AM
Error Date : Sunday, May 31st 2009 @ 09:55:16 AM
Script : http://www.mysite.com/forum/cron.php?rand=1243778098
Referrer : http://www.mysite.com/forum/video.php
IP Address : 118.94.xxx.xx
Username : Unregistered
Classname : vB_Database
MySQL Version :
I searched on Internet and found this:
http://www.vbulletin.com/forum/showthread.php?t=276985

where Steve suggests -
"You need to edit the db user permissions to make sure it has full permissions to that database, including CREATE"

But I did not changed anything at the database layer, so how come these errors start to pop-up??? Secondly, I would appreciate if someone can tell who is trying to create this table and why?

The only change I remember is I changed the administrator of the control panel to some other user using tools.php but I don't see any reason as to how this can cause this issue?

Thanks