Hi khromov,
I had a similar problem which turned out to be caused by PHP running many workers/threads with APC’s cache per worker/thread. So once a page changes on one worker/thread, the other workers do not know.
If this is the problem you may also find that if you make/update a post, it isn’t always visible on every page refresh, depending on which thread/worker the page was served by.
I did not find a way to get PHP workers/threads using a shared APC cache and ended up disabling the workers/threads in PHP until I get it working.
If this is the problem you are having, is unfortunately a server configuration is which will be difficult to have resolved here.
Peter,
What server are you running?
With Apache + prefork MPM, the default is one APC memory pool for all workers. So I do not believe what you are describing is related to my issue.
What exactly did you do to “disable workers/threads” in PHP?
Same issue here on my development machine with Apache 2.2.22 + PHP 5.4.9 + APC 3.1.13 and the latest version of the plugin.
