When you're pasting the address into the insert image box you're putting in http:// twice.......
When you click on the insert image icon it opens but it already has http:// in it (shaded in blue)......
If you just hover your curser in the area to paste in the address and than paste it it will automatically delete the
http://, but if you click in this address it will un highlight the blue and than when you paste you end up with 2
http://'s
This is a bit confusing.............
Easiest way..........
When you click in the insert image icon and the box appears delete the http:// that is shaded in blue out of it, then just paste in your url..........