BuddyPress.org

This sounds like you have object-cache.php running in your /wp-content/ folder right? I have seen this and can’t remember if it was object cache or xcache that was getting poisoned somewhere along the way. I would delete all contents out of your /wp-content/cache/ folder and reboot your web server (apache?). I have had all kinds of issues with object cache and frankly am trying to quit trying to use it

If it is something else, let me know but it sure strikes of a cache issue.

Trent