We're still debugging the issue. This is not the addon problem, something is conflicting with the addon. You have many plugins and a cache layer, so it's not easy to find the reason. I'll update you again today.
We found the issue and fixed it. That was caused by latest version of WooCommerce Membership plugin. There was a small incompatibility and we've fixed it. The wpForo Woo Membership Integration addon will be updated as well.