HTML5 output not playing

Question

Hi All
Using Captivate 7. Looking for some help on why I Randomly get this with some of my projects. The flash output works fine. So when I am in captivate and hit f12, no problems, but if I hit f11, the spinner just goes round and round. The problem happens in IE as well as Chrome. (see attachments). The only way  I have found to fix it thus far is to copy all the slides from the damaged project and paste them into a new blank project. Ths then works fine, indicating its not a problem with the slides. Its just really annoying to have to go and reset all the interaction ID's and the project settings such as reporting every time it happens. (Seems to happen on average once a week)
I have also cleared the cache (general settings -> project cahce - > clear cache), and this hasnt helped
Looking at the error, it seems like its something internal.
Love any ideas that people have got.
Thanks
Luke
***** Edit *******
Ok so now the next project I open up also has the same issue, but with a different error
But other projects are still ok, so its not a problem with the pc or the installation, as far as I can tell

Answer 1

Just as another thing to look at if you have any similar issues, I found that if I have a "-" in a drag and drop interaction ID it also failed with the error in the console of :
SyntaxError: Expected ':'
at b (http://localhost:51210/HTML5Temp5776550982271Pre/assets/js/CPXHRLoader.js:36:369)
at Anonymous function (http://localhost:51210/HTML5Temp5776550982271Pre/assets/js/CPXHRLoader.js:37:45)
SCRIPT5009: 'cp' is undefined
File: index.html, Line: 17, Column: 3
However no such problem when using the swf output, just the html5 output
HTH