Node View with language = current user's language is suddenly not working on italian

On my website www.enjoylakecomo.com, a node View which was perfectly working with language = current user's language is suddenly not working anymore with italian, I get a totally white screen, where as it's still working with german and english.
It happened after I changed the image size in the module Images. But still after I set back to the default size of 800 kb for images, the problem remained.
If I run the query with the module Views I get a the following An error occurred at /it/admin/build/views/ajax/preview/haus_secondolivello. Error Description: 500: Internal server error. Please see server or PHP logs for error information.....

My PHP memory_limit is 64 M and can't be set up higher.

I run multilanguage functionality with Internationalization 6.x-1.10.

What could be the problem? I am stucked and an important feature of my site is not working anymore. Would really appreciate help!!

Thanks.