You've not described the symtoms very well really. Are you getting the incorrect message all the time or does the code simply not appear to do anything? Maybe you get a blank white page?
Please see my signature for a very important tip too. It's in the big php box and it has a link under that to show you what the bug does in IE.
My helpful sig is on vacation trying to loose some weight. It got a bit fat and caused a few problems but it will be back at some point!