If this is still a problem, could you please turn on error reporting or check your error log?
You should be able to turn on error reporting by going to classes/class_initializer.php and putting this bit of code at the top, right under the opening php tag:
PHP Code:
<?php
error_reporting(E_ALL);
ini_set('display_errors', '1');
Or post your sidebar page after making the breaking changes. If you don't want to post it, you can message me it instead and I'll see if I can spot the problem.