ERR_CONNECTION_RESET

Hi,

since a few days we (www.erklaerpeer.de) are having the problem that we cannot post, update or preview pages or posts that have pictures included. When the page or post only has got text everything is fine. The failure always is a white page saying this page is not reachable and the message: ERR_CONNECTION_RESET. I have already deactivated all plug-ins and afterwards changed the design. After I changed the design everything worked well so I think there is a problem somewhere in the parabola theme. The only thing I changed was updating the language files because the translation for by was wrong. Anyone got any ideas what I can do to solve the problem?

Website: www.erklaerpeer.de