Ajax event handler methods that return a page instance, page class or page name should cause the client to redirect to that page, refer to
TAP5-187 and TAP5-613 for those fixes. Unfortunately the mechanism doesn't work in IE7 or 8 if the URL has a query parameter added to the Link object. We have an accountid parameter (e.g. /page?account=1234) added to all render URLs using method advice which exposed this issue.
The fix is pretty simple - just used window.location.href instead of .pathname
Unless there's a good reason .href was not used in the first place that I'm not aware of?