Hey there,
I have tried to access your site and posted a new quick post with photo. It seems to appear correctly,
http://danielederossi.net/ . What I did noticed is that when the photo is uploaded on quick post, it actually places the image under the /tmp/ directory first pending the user's submission but it seems like there are some permission issues on your temporary folder,
http://screencast.com/t/UC5lpSF2hjU
Also, please remember to set the domain for your EasyBlog license at
http://stackideas.com/dashboard .
By the way, the entire blog seems to blend in really nicely with your template! One of the best designs I have seen. Well done!