While working on a web application for a client I have stumbled on a bit of a paradox. The application is PHP/Ajax and we've tested it on all major browsers, including IE7-IE8.
However a client who has windows7 and I believe has IE8 is getting the error message below, and the application hangs, but when I use it on IE, Firefox and Chrome its fine.
Could this be down to a security issue on the browser that we could change the setting on as Their IE8 and my IE8 aren't matching up.