Problem with WP-Cache

Hi all,

I’m having trouble using wp-cache, no pages are cached except /blog/feed, but /wp-content/cache is writable by the web server and everything seems ok.
In my point of view, the only thing that can interact with wp-cache is that I have put on my theme’s files some custom php code in order to retrieve informations (especially into sidebar.php) from a link directory that is installed on the same web site. Is it the reason why wp-cache is not caching anything?

Thanks a lot for your answers.

Regards,

Tony