[TYPO3] boros_imagecrop why doesn't work on my installation?

[Matyi Gábor]

Hi!

Customer likes to scale and crop the uploaded images within BE. How can do that? I found the boros_imagecrop extension. Simply I installed it and If I'm on the filelist and I click on an image, I see a new element (crop images) in the local menu.
If I click here I have a selector box, but I can't see the images. 
Does anybody use this extension?