2.0 is a major rewrite of the theme and unfortunately to better support new features I choose to use the core custom header. You can simply upload your old header into the new area. There are still many options under the techozoic setting page to control the placement of the header.
It looks like for some reason during the upgrade the page width got messed up. If you go to the Layout tab of Techozoic Settings and change the Page width to another value than zero and make sure that if the fixed width is set the value needs to be in pixels and if fluid width the value is percentage of screen.