I bet you’ve Never seen such WP-Cache 2 Problem

Problem
I have latest WP-Cache 2 installed and it is not caching properly.

When I go to Options > WP-Cache, and hit the “List Files” button to see what is being cached, everything EXCEPT POST is being cached. I checked the cache folder in wp-content, I can see hundreds of cache files being generated and stored there. I believe it is able to generate the cache but it just doesn’t recognize it.

I’ve tried reinstalling WP-Cache 2, restore its default configuration, even reinstall WordPress, all doesn’t fix the problem. I’ve also tried disabling all other plugins and left only WP-cache2 activated, still no luck.

So it’s not WordPress problem, not plugin conflict, could it be the server then? I’ve recently migrated to a new dedicated server which is running PHP5. Previously it’s running PHP4.

Any suggestions? Thanks.