blackant
I can see possibly two problems with this:
1. Cross-domain error (have you checked browser console?)
2. You are not using the load url action correctly, i.e. you are supposed to wait for 'On image URL loaded' to trigger before trying to load an image (not essential, I think, but good practice).
If you try an image from one of the usual image hosting sites, such as 'http://i.imgur.com/QZhRLp7.jpg' then it will work.
So, essentially, not a bug, but a cross-domain issue.