There ist a problem with the HTML5 video stack when used in a RapidWeaver 7 project:
I create a Foundation test project in RapidWeaver 6 and embed a video via the HTML5 video stack. I can see the video in RapidWeaver preview as well as in local browser preview. That’s what I expected. I upload the project, everything works fine
I convert the project to RapidWeaver 7. Now I cannot see the video in RapidWeaver preview, same in local Safari preview (local web server). Preview in Chrome works fine, but FF has the same problem. I only see a black area. I have to publish the project to see the video in the published project.