cachesessions

We've had zero changes to our Xenforo boards since forever, and the disk space appears to be fine at 60% free. However we appear to be getting session issues during the login process that is causing the logins to not complete after authentication. A correct username and password just flips back...

I've been tweaking my server today and replaced my Libmemcached backend cache with APCu because it's faster (in my set-up). Unfortunately, with cacheSessions enabled everyone gets logged out anytime you stop/start or restart Apache because it flushes the APCu cache. The "fix" was removing the...