Right I've had a thorough check of my settings now.
1. I had "80" in the "Redirected http ports" box in the basic tab of the Web shield settings.
2. When I intially reported the problem I had not manually configured the proxy server;
I then configured it, as per the video, for http only;
I've now set it, as per the text faq, for ALL protocols.
When I first had this trouble - no manual configuration of proxy, setting it cured things.
When it came back this morning turning off the proxy cured it.
I have now set the proxy again (all protocols) and cleared the "redirected http ports" box. I think that this is the transparent scanning & thus hopefully it was this that was causing the trouble. Right now all is well again.
I can't honestly remember whether I clicked "Yes" or "No" to the transparent scanning on installation.
I have ZoneAlarm Pro version:6.1.737.000, privacy settings:- Cookie control medium, Ad blocking high, Mobile code control off. (I haven't changed these settings throughout)
Was it the entry in the "Redirected http ports" box that did it? (my fault for not saying "No" to transparent scanning)
Why do the video and text faq give two different versions of how to configure the proxy?
Thanks for your patience with a slow learner..