Thanks for pointing me in the right direction and inspiring me not to give up!
The broken images are the launch page "splash logo and the "Page Background Image" on the page setup meta data tab. There are no images designated in the meta settings fields.
So I'm now using css to hide the splash logo. and I placed a grey tiled gif for the page background image. This has removed the 2 broken images.
There is now another problem. The page is empty except for a logo centered in the middle of the page, yet there's some invisible content or divs causing the page to scroll down.
Looking at the code there's an div with ID "supersized" that seems to be the cause. So I hid that using css, but there is still a min-height on the launchpage of 600 pixels, which is still causing a scroll bar, especially annoying on an iphone. So I forced min-height to be 100%.
Now I'm nearly happy but the last problem is that I'm having a hard time getting the logo centered vertically. It looks fine on browsers and on iphone held vertically but horizontally it moves down too much. I am using a margin-top:20% for the launch-content to push the logo down.
Here's all the css I'm using on the page: