[itsid]

Uh Dermio.. No I have no idea at this very moment.
this sql query seems to be from the -has posted- if condition that has to be in three plugins, but why you cannot access the post-table is a book of seven seals right now.
Maybe the database layout was changed too in 3.6.3 but I don't know.

I'm wondering about the vBulletinpost, is your tableprefix vBulletin? (no underline at the end??)

Well do me a favour and go to your (service or something) ->table repair option in acp (no need to repair anything, just take a look what the table is called actually) there you will find all names of tables in your database.
please let me know, maybe I'll find a solution for you then.

'sid

[EDIT]
So, I've asked a friend of mine to see what sql-scheme says, that's

PHP Code:

$schema['CREATE']['query']['post'] = "
CREATE TABLE " . TABLE_PREFIX . "post (
    postid INT UNSIGNED NOT NULL AUTO_INCREMENT,
    .........
    visible SMALLINT NOT NULL DEFAULT '0',
    .........
    FULLTEXT KEY title (title, pagetext)
) $enginetype=MyISAM
"; 


AS you can see you have to have the post-table AND the post.visible too
I still don't understand what causes this error, maybe just an error with your table-prefix,
please check table-prefix settings first
[EoE]