Ok, I tried turning off all the WP-BP options and then uploaded SP-BP. I was able upload it successfully, but upon activation I do get kicked out of my login session.
So to be clear, I no longer receive the fatal error message anywhere (from what I can see). It looks like I am just getting logged out and I cannot log in as the administrator (it appears I can login as a normal user, but it is extremely sluggish). I occasionally get errors about redirect loops when I try to log in.
If you like, perhaps we can try troubleshooting some things on my site Friday? I don’t have a mirror site, but I could set one up by then and test if the same problem happens on my mirror site.
I also have a live chat room on my site so we can talk in a password protected room and every time there is an error I can go into my admin panel and remove the plugin manually. Let me know your thoughts.