Reported on german board phpBB.de: https://www.phpbb.de/community/viewtopic.php?f=147&t=234192

Images are wrong resized after upload with plupload. The problem is, as stated in the post, that the parameters are in the wrong order.

Open: phpbb/plupload/plupload.php
Find: (around line 268)

$resize = sprintf(

	'resize: {width: %d, height: %d, quality: 100},',

	(int) $this->config['img_max_height'],

	(int) $this->config['img_max_width']

);