Started a new thread for this issue which christianebuddy was having in another unrelated thread.
The issue is one in which the "Invite Friends" link fails if you are forcing https.
The symptom is this error:
Error Error while loading page from <app name> Empty response received.
When trying to load the invite friends link in https mode.
I *think* based on this Facebook developers blog post it might be related to SSL certificate issues.
So, anyone here using WPBook with SSL mode and have Invite Friends working even with forced https on?
I don't currently have a test blog with HTTPS to test it on so I'm looking for others . . .