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I've been using Drupal on my apache VPS successfully for a while now (still in testing stage), and I thought I'd try and install mod_gzip and see what difference it made.
I rebuilt apache with mod_gzip, and now my sites seem faster, but I'm now getting served stale cached pages from Drupal, I have to manually Refresh each page to get the "real" page.
It even sometimes displays cached pages from other user sessions! Of course you're not actually logged in as that user, but this is only discovered when you manually Refresh the page, or try and Post a Topic etc...
Any suggestions on what might be causing this would be greatly appreciated!