Hey, what do you mean with "project preview" page? When I'm on your site johannaheck.de it seems that everything is working, but some project's links are like "http://johannaheck.de/?p=357", but they should be like "http://johannaheck.de/projectname".
Please take a look at http://laytheme.com/troubleshooting.html at "Nothing shows up on my website" to see how to set permalinks, maybe that helps!
