View properties problem


We recently created a new MOSS 2007 server which we plan to use as WFE load balance server. We successful moved custom code across and the document link handler. However for some reason the view properties function only works some of the time. Most of the time we get a 404 message. Does any one have any ideas what I should be looking at to resolve the problem. As far as I can see the new server is virtually an exact equivalent of our other front end server. The frustrating part is it does appear to work sometimes. Thanks Amber