hey, i expect i'm not in way to bother you .. coz "at the very bottom",
i 've just seen, not the "use wpdb..etc" .. but that:
" Fatal error: Out of memory (allocated 28573696) (tried to allocate 36303 bytes) in site adress/wp-includes/wp-db.php on line 949
may this comes from your plugin, but from a bug in my db too ??
..
let's know
and thanks for your work !