I don't know if this can be fixed, however I am still going to ask.
Whenever someone hits the back button on their browser when completed a form, they get the message "Your session has been expired. Please start again." which of course is great for not receiving duplicate entries, it causes one "small" problem with my forms.
The website's design breaks down. It does not load the rest of the page after that line. Probably cause of the string which is used. Is there not another way, with still showing the expired message, but ALSO load the rest of the page (design)?