caption shortcode lost caption-attribute?

hi!

In the past (< WP 3.51) the shorttag output of the media library was:
[caption id="attachment_12345" align="alignnone" width="100" caption="My Caption Text"]<img src=”myimage.jpg” />[/caption]

Now, this changed with the WP 3.51 update to
[caption id="attachment_12345" align="alignnone" width="100"]<img src=”myimage.jpg” />My Caption Text[/caption]

Because of this my img-captions are broken now:-/

I hooked up into the caption shortcode:

add_shortcode('wp_caption', 'myImgCaption');
add_shortcode('caption', 'myImgCaption');

extracted the caption-text for further processing with

function myImgCaption(){
	...
	extract(shortcode_atts(array(
		'id' => '',
		'caption' => '',
	), $attr));
	...
}

.
This worked pretty fine, till now 🙁

What can I do, do force WP into the old structure?

Thanks
mark