CoursePress Pro + MarketPress not functioning and crashing my site

CoursePress Pro and MarketPress aren't functioning. I'm not sure which is the culprit but I am not able to sell courses. All courses are listed at $0.00 instead of the price they are set at and users cannot register or purchase courses. In addition, the plugin is using all of my site's memory - if one person tries to access any of the course pages, the entire website will come down. Need to get this resolved ASAP. I have granted access to support team within the site.