I'm getting some SQL erros. The main cause seems to be that some queries use double-quotes to enclose literals.

For example:

ERROR: column "site" does not exist<br /><br />SELECT id,courseid,userid,content,format,created,lastmodified,usermodified,publishstate FROM mdl_post WHERE userid=2 AND publishstate="site" AND module="notes" ORDER BY lastmodified DESC

in the note_list() function.

It would be interesting to fix this and to perform a quick review to detect-and-kill such quoting.

Ciao