Cam movement (lookat) problem

vvvv beta question
6

Here again the files.
Here comes the link how I wanted the Cam moving forward:
http://www.youtube.com/watch?v=PxINUBOLmi0

@Kalle: searched for 3 days. there is only one explanation (here):

But I don`t understand it until yet. Sorry!

This Patch takes a x file and place boxes aso at it. The not working Cam-movement is on the upper right side in the patch (420.9 kB)
this is the x-file. please name it “test.x” and load it into the xfile-node lower left sid in the patch. (49.7 kB)