At this time I believe that Paypal is only unresponsive on some older MSIE browsers. It seems to be working fine on MSIE 10 and later. I noticed also that the problem is not with TBG... if Paypal no longer supports a particular browser or browser configuration then you can't even get to their main page at
www.paypal.com by typing it in the address box. Since this is entirely outside my control I have modified the online store to eliminate Paypal as a purchase option when the Paypal website cannot be reached with the browser that you are using. This issue is now closed.