5.6.0.1 - Gray Overlay, No theme, No editing possible

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Hey!

I´ve just installed 5.6.0.1:

1. I used the localserver EasyPHP
2. It didn´t work directly, but I managed it as an upgrade from 5.5.2.1
3. Even after the first install (5.5.2.1) I had a gray overlay over the whole Dashboard which disabled me any editing. I turned the gray overlay off with CSS and then I could do something.
4. Upadate didn´t solve the gray overlay problem.
5. I don´t have any template insalled, although I asked for an template to install at the beginning.
6. I can not add pages in dashboard and when visiting a site I get the "Page not found" message.

Friends, do you have some suggestions what could be wrong?!
Is it the local server?

Thanks!

Agetis