We just backed off a server configuration change that was starting to produce an infrequent but increasing number of sporadic problems with attempts to access our servers. This issue may have resulted in errors regarding redirection (e.g., "redirect loop", "too many redirects", "page isn't redirecting properly", 301 Redirection errors) and other mysterious glitches related to contacting our service, uploading/downloading, loading the cart in your page, etc.
We have restored our last-known-good server configuration which seems to be working fine now, and we do sincerely apologize for any inconvenience and concern you may have experienced as a result of this glitch.