When I try to save a TeamRaiser page with a responsive format, I get the following error: "There was a problem processing your request." There is no other indication of what the issue is.
Before we are able to change the page to a responsive format, it requires that certain fields under Text Options are not blank. Try populating the fields with any value before attempting to change the layout. Once you are on the desired layout, it may give you a different set of Text Options that you can populate. Some of these Text Options may or may not be required and unfortunately they are not indicated. We hope to address this unintuitive design in bug # 68103.