Blank box on another web hosting service

[rough76]

Hello, I can't resolve this problem for my website (it's the official site of an important Italian weekly satire magazine): http://www.ilruvido.it

Here are the settings:
http://img684.imageshack.us/img684/2860 ... lleryo.png

I don't understand where's the problem, because I've tested FGC on another test-site without matter. I've tried every suggestion here found, but it's ineffectual. What can I do? I think the problem can depend on web-hosting, because I have many problems that I'm resolving little by little. I was planning to contact the web-hosting help, but I'm afraid they don't know how resolve the problem.

Any suggestion?
Please, help me/us!

Many thanks!

[admin]

try this solution. it should fix the issue
error-trying-to-use-invalid-xml-markup-818.html

[rough76]

You're very very very kind, thanks so much
Another question: I've changed the file permissions for the plugin. What are the best settings for directories and files?

[admin]

755