Martin,

I hope most of our updates are done.  We are still debugging a few things.  I would highly recommend reinstalling Vista SP2.  There were several stability and security updates in it.  I use FireFox as my browser, but I have IE8 loaded also.  NAT is working fine in both of them here.  I would suggest clearing your cookies and history in IE and see if that helps.  I like FF better, but that is personal preference.  The changes that we have made were all designed to speed up the site and reduce the processor load on our server.  We are cache many of the pages now instead of creating all pages dynamically as the are requested.  None of this would cause your computer to lock up.