I have installed wordpress 4.5.1 and installed coursepress pro on top of that.
I went ahead and added a course in the admin along with a couple units.
When navigating to this page:
i am getting the following error:
Warning: array_key_exists() [function.array-key-exists]: The first argument should be either a string or an integer in /nfs/c05/h01/mnt/76775/domains/a2d.com/html/wp-content/plugins/coursepress/includes/classes/class.course.php on line 374
you can visit the page.
Please let me know if you need more information.