Is there a size limit on groups/classes?

At the moment, unfortunately, yes. Due to hardware constraints, we are limited to 400 concurrent player reservations per day. 

Additionally, we limit curators via the use of Seat Credits. One Seat Credit equates to one student's access to a workspace for the duration of one day. Seat Credits are returned to the curator's account after the assignment reservation has ended. We are constantly working to improve this limit.