I have very strange behavior of a4j events. In some pages, activation of a4j support event activates full screen refresh and the new content of the screen is the a4j response XML. If I work with IE I get empty screen and in firefox I get the response as source code. I can't reproduce it on development environment and it happened only on production server that works behind apache server. It is an urgent problem and will be very thankful for a good answer.