Hi Bojan,
Thanks for the quick response. Unfortunately, I am unable to try out what you’re requesting, my site is highly trafficked right now and deactivating plugins would screw up a lot of things right now. I could probably put it on a test server to try, but I know the issue is arriving after people sign up for membership, pay via PayPal, and then come back to the site. Users who are just viewing the site as visitors have no issues. It’s only after they sign up and pay that the website goes blank for them.
I’m unfamiliar with the .php file that’s listed in the error log that I posted before, but it’s from your plugin. I never had this issue until I updated to your latest version, if that helps at all. Everything else about my site is completely up to date.
Any other ideas?