I did a little more digging into this, as I see it you are creating a db table "$db->query_write("ALTER TABLE " . TABLE_PREFIX . "thread ADD thumbnailurl varchar(250) NOT NULL");"
I checked my DB and there is not a Table_Prefix , nor a threadinfo, nor a thumbnailurl field
<td><input type="text" class="bginput" name="thumbnailurl" value="$threadinfo[thumbnailurl]
I think the problem is that the table was never created nor the field for the table so the info is not getting saved properly. Can you help me figure this out?
I manually created the Table "threadinfo" and put in the field "thumbnailurl" but it did not seem to make a difference.
http://i42.tinypic.com/29bkl6h.jpg