Different Issues afetr manual upgrade

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Hello
I just upgraded manually from concrete5.4.2.1 step by step to concrete5.6.0.2

Now the website is working again but..

1. There is no header while logged-in, its only white.
2. If i go to the domain namehttp://frohsinn-arlesheim.ch there is first the login page instead of the site itself. Only after login I can see the site
3. Some Galleries, Fancybox and GoogleMaps is not working anymore.

How can I find out whats missing / what when wrong?

Luke