I've just put a new theme on my blog and it all looks like the test one I made in instant WP, which is a good thing!
However I've come into a couple stumbling blocks:
1) When I click on the menu bit in appearance I can't put in my new menu, the one bit for customer links is translucent and there are no buttons to add a new one.
2)My header image worked in the test, I've added it to the media section and I can see it ready to crop, but clicking on crop and publish makes the screen go white and not get to the save section. The file is <40kb and in png format and worked in the test section.