I really do not know what caused this and I only noticed it the other day when doing an order over the phone(although it has not been going on for too long)

But if there is an error on checkout payment(such as bad cvv, wrong credit card number, etc, it does this:

main_page=checkout_payment&payment_error=mg&error=The+credit+card+number+startin g+with++was+not+entered+correctly%2C+or+we+do+not+accept+that+kind+of+card.+Plea se+try+again+or+use+another+credit+card.&cc_expires_month=01&cc_expires_year=10

and it loads a completely blank page. I tried the error loging program and printing out(via configure.php) but there are NO fatal errors(just a bunch of warnings like header already sent)

Also if correct information is included, then it works just fine and allows checkout. Any ideas on where to start