Are there any Javascript errors?

If the browser encounters Javascript errors, it usually stops Javascript execution. In my experience, if that occurs in the page, that cuts off the editing controls so that "Add to Main" doesn't appear, and so that the editing controls up top don't really work correctly.

I think an iframe is handled like other block elements (such as an image), so it shouldn't align itself over the link. Can you see the box outline that shows up when you are editing blocks?

Yes, I can see that dotted red outline, and the box highlights like it should in edit mode. Theres no errors, everything works fine,I've tested the header tabs aswell.

Don't worry I've sorted it. I've made the iframe smaller then added content below it and that has seem to have forced it to show. Thanks