OK,
I just got back to this and found errors as follows:
[26-Feb-2011 18:22:18] PHP Warning: require(includes/classes/super_order.php) [<a href='function.require'>function.require</a>]: failed to open stream: No such file or directory in /home/sailspo1/public_html/includes/classes/order.php on line 637
[26-Feb-2011 18:22:18] PHP Warning: require(includes/classes/super_order.php) [<a href='function.require'>function.require</a>]: failed to open stream: No such file or directory in /home/sailspo1/public_html/includes/classes/order.php on line 637
[26-Feb-2011 18:22:18] PHP Fatal error: require() [<a href='function.require'>function.require</a>]: Failed opening required 'includes/classes/super_order.php' (include_path='.:/usr/lib/php:/usr/local/lib/php') in /home/sailspo1/public_html/includes/classes/order.php on line 637
So it must be something that changed with superorders. I'll see what I can find.