And now it looks like it was a DNS error after all coincident with my trying to contact Photoshelter for the first time with 4.6 as I can now connect in 4.5.4 and 4.6.1. Please note that the Photoshelter logo on the File Uploader page is too big and overlays the Preferences button at the bottom ... when you mouse over the button it then overlays the Photoshelter logo. Not sure it is a big deal.
It seems every error I report is a pilot error or a network error ... sorry to have bothered you yet again, sigh.