This is a strange problem, I would guess it is something wrong with your Apache config, maybe you can post the virutualhost config for this domain name.
Do you have any proxy server between the real webserver and the clients that has got a very aggressive caching ?
Best regards
Egil Fujikawa Nes Fujikawa Engenharia de Software Ltda
BuildCMS - Av. Paulista 777, 15° Andar - CEP: 01311-100 - São Paulo
URL: http://www.buildcms.com
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