CustomPress Network custom fields

We have a network site that we intend to use with the CustomPress plugin for quicky adding some custom fields to posts and pages across our various sites. Adding a custom field works fine on a site level however when checking 'Display the network-wide content types on sub-sites.' on the network options page we receive an error message when trying to edit any page or post:

PHP Fatal error: Cannot use string offset as an array in C:\DIR\wp-content\plugins\custompress\core\content-types.php on line 712

We were able to fix this by adding a network enabled post type (not a big issue, but not something we currently need for this project). The field now shows on all the pages however anything entered into the field is not saved when updating the page (site specific fields are still saved).