Cannot open a unity 3.5 project into Unity 4 - beta version

Hi there. I’ve recently preordered my unity 4 beta version and tried to import a project created in unity 3.5
I was wondering why I cannot import the project properly: in the hierarchy window I can see the structure of the game but most of the elements are missing, thus I don’t have the possibility to see the objects in the viewport (e.g. in the ispector the mesh renderer component disappears as well as other essential elements like textures, materials and so on).

Specifically, I tried to open my project by both clicking on the scene file and opening it inside of unity but nevertheless it doesn’t seem to work.
Could you please me give me any advice in order to solve the problem?

I thank you very much,

bye.

I ran into same problem… Is there any solution to this??? please help!

try delete all obj models