Files with non American characters (like ü) doesn’t work

Hey!
First of all I’d like to congratulate you on this awesome plug-in!

I’ve been using it and it’s working fine, with one exception: if a image file name has non American characters (like ü, é, etc) don’t get displayed in the whitebox; instead, it opens the image URL.

I see that the problematic images doesn’t get the lbwps atributes that the regular one does.

Is it something simple to fix? Is there any workaround?

Thanks a lot!