IE had that problem for about a decade (on many sites) and it was related to an IE caching bug. It's mostly fixed in IE now, along with some workarounds in Apache. You may want to check type cache settings and also check a few different sites, especially a very simple, non-PHP, unprotected plain jpg.
__________________
For historical display only. This information is not current:
support@bettercgi.com ICQ 7208627
Strongbox - The next generation in site security
Throttlebox - The next generation in bandwidth control
Clonebox - Backup and disaster recovery on steroids
|