[Plugin: ProPlayer] Default sizes not working

I’ve gone into ProPlayer’s settings page and set my dimensions to 540 width by 398 height. But whenever I insert a video into a post, it gives me 530 x 253, thus ignoring what I entered under “Defaults”.

Anyone know why it’s doing this, or what the fix is? I fixed it on one site by editing the proplayer.php file (addOptions function), but if there’s a way without having to do that I’d like to know. Thanks!