White pages on IIS mean there's something wrong server side, e.g the PHP, if you're using an updated version of php and you have php that isn't rev's template e.g, top stats etc that people have released. MySQL was deprecated from PHP and won't work, may be that. Other than that, you may have...
UPDATE items SET user_id = 10, room_id='' WHERE id = 321;UPDATE items SET user_id = 10, room_id='' WHERE id = 310
The queries fucked up + looks like it's trying too execute two in the same query.
Correct:
UPDATE `items` SET `user_id` = '10', `room_id` ='' WHERE id = '321'
UPDATE `items` SET...