I recently installed a well known program called Amaya to create and edit an web site. The app is quite nice and works well, shame that it rewrites the way that my PC handles html and htm links.
The result (and I have replicated this on two PCs) is that when I'm sent an email with a link in it, I can't open the link or various other htm/html links. The problem can be resolved with some fairly wicked hacking with the registry via setting your default browser back to IE and then returning to Firefox.
Why and how did that get past testing?