I was having the same problem, and found a solution.
Disable the following items:
public $ caching = '';
public $ cache_handler = 'file'; # (replace memcache, per file)
public $ cachetime = '1600';
public $ memcached_persist = '0'; # I was in '1'
public $ live_site = ''; # (remove the full domain name)
public $ gzip = '...