>>Using Opera 8.54. (Note: This is not the latest version; I found the latest Opera version, 9.x, to be unsuitable for several Web sites I visit.)
>>
>>The problem: On the main page of the Universal Thread, I often see the same contents (news) for several days, until I explicitly refresh. That is, when I type the URL, I get an older version from the cache, until I press F5 to refresh.
>>
>>Opera is set up to check for a new version of a page after 5 hours, and - for comparison - on the BBC site I don't have this problem, i.e., I do get the latest news, without explicitly refreshing.
>>
>>Of course this is not a major problem, since I can always refresh explicitly. But I was wondering what could be causing this. Perhaps the date/time stamp of the main page is always the same?
>
>The Index.asp doesn't change but its INCLUDEs. That version must rely only on that which could cause that behavior.

Is index.asp the container, and does "INCLUDEs" refer to the contained frames?

That might explain the mystery; that only the container is checked.