Mini Loops plugin

Hi everybody,
I have a small issue with the Mini Loops plugin. I’m trying to get the URL to an image.

I created a custom field using the Magic fields plugin. The field is called “sidebar_thumb”.
When I try to fetch the image in the widget:[ml_image from=customfield cfname=sidebar_thumb] I get a wrong URL.

This is what I get:
http://www.mydomain.de/1328357526sidebarthumb_test.jpg
and this would be the right URL:
http://www.mydomain.de/wp-content/files_mf/1328357526sidebarthumb_test.jpg

I have no idea what the problem might be. I could understand if Mini Loops couldn’t access the Magic Fields info at all. But changing the URL?

Any ideas are much appreciated!

Cheers
Hendrik