When I hit the button to create the tour PTP started to create no tiles which shouldn't be the case as nothing was changed. So I hit the cancel button because form my current project this is very time consuming. Unfortunately I now have some strange things in the initial high resolution panorama. Not amused. Currently I'm creating new tiles all over and hope this will solve the issue.
hours later: Issue was solved by creating all new tiles.
Yes it's a workaround to generate again "all tiles" for the first rendering on RC1 due to multi-resolution for HTML5 entrance. Think to uncheck the box "generate all tiles" after the first new build in the build screen to improve time of next rendering.