Weird behaviour Concrete5 latest developer

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Hello, I have installed the latest developer and where I actually got the toolbar at the frontend working. However, I had to delete the template a couple of times, due to some strange behaviour if I changed something to the
class="<?= $c->getPageWrapperClass( ) ?>"
. With my theme I had to make it work first put it in the
<body>
to make it work, and if I than put it in a
<div>
it stopped or when i cleared the browsers cache it disappears again. I have looked at the scripts that is in the theme and to concretes scripts, there is only one script that doesn't matter, the one for cookies. all the other have to remain in there so it does work.

For now it's working but now I have to login all the time, sometimes when I switch in the backend when clicking on whatever link there is. also found one error that I can't put my finger on: Refused to executehttp://www.duraweb.nl/ednse/index.php/ccm/assets/localization/jquer... as script because "X-Content-Type: nosniff" was given and its Content-Type is not a script MIME type.

i have no ccm folder so I don't know where that is coming from, so if anybody can help me on this one, that's much appreciated.