images larger than 56 kb appear broken after upgrade to wordpress 4.0

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My site is lianavoinea.opa.ro. After I upload files larger than 56 kb I get the http error. If I refresh, I find that the image has been uploaded though. However, its thumbnail appears broken. Here a printscreen: http://lianavoinea.opa.ro/wp-content/uploads/2014/11/broken-thumbnails-worpress-4.0.png. The problem is not caused by my host, because on another site on the same domain(agrobun.opa.ro) even if I get the http error, on refresh the thumbnail is not broken. The file permission is not the problem, I checked in Filezilla and it is 755. I would be very grateful if you could help me and I will not have to downgrade wordpress. Thank you!!!

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