I am getting a warning everywhere for this on my WP version.
Warning: Parameter 1 to array_multisort() expected to be a reference, value given in \wp-content\plugins\custom-field-suite\core\classes\api.php on line 498
Adding an @ to that is dodgy, but seemed to fix it, without breaking anything.
The other one that I am seeing is with the WYSIWYG, it displays 'wrong' until I click the resize icon once then it corrects itself. Can't really figure that one out atm.
Other than that its a great plugin. Simple and effective.
The form validation also does not seem to work, if I set a field required its ignored.