Quick Cache Plugin Not working: no Mutex Lock?

I installed Quick Cache ok at this site: http://www.mysecondmillion.com and on my other site too – it’s the same problem.

I Checked everything 3 times. When I log out and look at my view Page Source there is no green Quick Cache information at the end of the page.

I checked wp-content/cache/advanced cache (I think) – and I found this about Quick Cache (an extract):
———————-

if (QUICK_CACHE_USE_FLOCK_OR_SEM === “sem” && function_exists (“sem_get”) && ($mutex = @sem_get (1976, 1, 0644 | IPC_CREAT, 1)) && @sem_acquire ($mutex) && ($cached = true))
file_put_contents (QUICK_CACHE_FILE, serialize ($headers) . “<!–headers–>” . $cache) . sem_release ($mutex);
/**/
else if (($mutex = @fopen (WP_CONTENT_DIR . “/cache/qc-l-mutex.lock”, “w”)) && @flock ($mutex, LOCK_EX) && ($cached = true))
file_put_contents (QUICK_CACHE_FILE, serialize ($headers) . “<!–headers–>” . $cache) . flock ($mutex, LOCK_UN);
/**/
return ($cached) ? $cache : $buffer . “\n<!– Quick Cache: failed to write cache, unable to obtain a mutex lock at the moment. Quick Cache will try again later. –>”;
}
else /* We need to report that the cache/ directory is either non-existent ( and could not be created ) or it is not writable. */
{
return $buffer . “\n<!– Quick Cache: failed to write cache. The cache/ directory is either non-existent ( and could not be created ) or it is not writable. –>”;
}
}
/**/
ob_start(“ws_plugin__qcache_builder”); /* Start output buffering. */
}
}
}
}
/**/
if (QUICK_CACHE_ENABLED) /* Only if enabled. */
call_user_func(“ws_plugin__qcache_handler”);
?>
————————–

I’ve tried Mutex Flock and Semaphore in settings but still no green text showing.

The strange thing is that my site is now much faster, and when I update any Post, I get a message saying that Quick Cache has updated the cache.

So is it working or not? Or could it work even better? …Something weird is happening here, but I don’t know what it is….do I, Mister Jones… – But I digress.

Any clues anyone?

http://wordpress.org/extend/plugins/quick-cache/