Based on the URL in your original post, you have a pretense for using spaces in your addresses. If your host switched to a .NET or IIS6 engine, instead of automatically converting the space to an ampersand character (%20), it just sends back a bad request error.
To get the URL I just right-clicked on the links on my blog and copied the URL’s from them. Do you think all the extra mumbo-jumbo in the one link could be from something not getting converted right? If so, how could I type it in to get the correct URL?
Thanks for any help you can give.