Hi, Troy,
Thanks for the response. There is no error message; the sites just fail to load (the progress icon spins forever, or at least until I run out of patience).
Here are some examples of sites that fail:
http://www.ucdenver.edu
http://www.uchsc.edu/sop/
http://www.uchsc.edu/
When I attempt to connect to any of these sites or their sub-pages (using a direct URL to the page), it just never loads. Things were working without problem until the last day or so. As I said above, all of the sites will load quickly and without problem in Safari on the same system at the same time.
Any suggestions will be gratefully received.
Thanks,
Dave