We are in a bit of a bind right now and need to try and get an answer ASAP today to see if we need to make a drastic switch. Here's our story:
Right now we have a WordPress multisite install running Paid Memberships Pro to govern access across the network (shared user table for the whole install). We have been setting up LearnDash as our LMS on one of the subsites and, up until yesterday, thought it was going well. Turns out that LearnDash and the payment gateway plugin need to reside on the same site, and we have user registration on the parent site of our network and LearnDash installed on a subsite. For the most part it works but it does not unlock the course access across the network, which is a major show stopper. How we missed this over the past few weeks, I'm not sure.
Anyway, we are both looking for assistance from LearnDash and exploring other LMSes. What I'm wondering is, will CoursePress work with Paid Memberships Pro (while I know you have similar gateways in CoursePress, we can't afford to change that!) and will a user registration on one site activate CoursePress access on a subsite in the same network?