Problem hocking up a itg3200 (gyro)

Hello @all,

I'm playing around with my itg3200 from Sparkfun and my Arduino for some time now.
For the first time it worked well, but since a week I have just 1/4 of the former scale factor. What I mean is, that on 360° I had around 16000 of that strange units. Since some time now I only have 4000 on 360° and I can't figure out what has changed.
The "driver" I use is this one: Google Code Archive - Long-term storage for Google Code Project Hosting.
On that page you also find the latest Specifications but I don't get it. (Thats the point why I use that driver)

May you could help me and tell me what my mistake is.

Patrick