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I tried that too.  But note that you are using two different caches.  APC can function as both a memory cache and an opcode cache.  You are using both.  The opcode cache is suspect in this case.

I only tried disabling the memory cache by commenting the cache configuration in your library/config.php file.  The opcode cache is more transparent and doesn't involve any special configuration in XenForo.  You would have to remove the APC extension from PHP to disable the opcode cache.