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Did you read down to 'Expiration calculations'? What w3 says *is* how the web works, or at least in that ballpark. There's a huge diversity of participants in the WWW and they've all been guilty at...

That workaround may still work. It's going to be difficult for anyone to help you with a secret system... I recall on one of my sites once having to clear the Java cache (taking the same steps you...

No they're not. Thanks for the extra details.

Just a thought - if this is a browser cache issue and you are in control of your own web pages, there is one good way to circumvent the perversities of browser caching and that is to add a 'query...

How is the program distributed? It sounds as though the issue may be out-of-step Java classes, which should only be possible if class files are being distributed independently of each other.

We...