I got this problem also, also there is problem with content if Program is installed on different drive than content.  I also notice crash if attempt to render a scene with not all the content there.

This is on 64 bit version. I have not try the crash problem with 32 bit version or on my 32 bit machine. I running xStream (Lightwave)  - not sure if that makes any difference.

But thanks for thread.  I will definely re-download the extras cd.  Extra cd is still small size. But it might be different from xStream and Infinite. Is there another place besides the E-on email to get it.