I think I cracked it by 1stly making IE8 as the default then reverting the default back to Mozilla and so far all's working well.
It looks like someone else found an issue with the browser?

Just because a particular browser will work with some things doesn't mean that it will work with them all. This goes back years as far as secure connections are concerned.

Please try using a different browser, just to see what happens. I am trying to narrow down where the problem is occurring