This is probably a feature:

Where I have CGI-generated pages I often set an expiry date of 'now' to force the browser to reload each time the page is accessed. I want to avoid the cache giving out-of-date info. On Netscape I notice that this gives a 'Page expired' error on back-button (which is better than using old page!).

Could be you've got something similar?

In reply to Re: Why does back-buttoning to a CGI page yield 'Page expired'? by Anonymous Monk
in thread Why does back-buttoning to a cgi script-output page yield 'Page expired'? by dyfn

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