Controlling the agilent 89441A under Labview

I am trying to communicate with our 89441A Vector Signal Analyzer via GPIB under Labview 7.1. I downloaded the intstrument driver (v1.2) from the National Instruments website.
The application example works fine. But this example uses the instrument mode "vector", and I'd like to use the "scalar" mode. When I change the instrument mode, the returned data is unexpected. The shape of the plot doesn't change, but the X-data (frequency bins) are in the range -7kHz to +43kHz, were I expected 0..+50kHz. The analyzer displays 0..50kHz on the screen, but the plot on the computer is shifted 7kHz to the left!
I have no clue on where to look: Is it a driver bug, an instrument bug, or am I doing something wrong? Please help me out here... Anyone experience with this issue? Does anyone at all have experience with controlling the 89441A?

Yes, I have looked at the programmers manual (I even have a hardcopy ), but unfortunately that didn't bring me any further.
I'm afraid not so many people have a 89441A, but if anyone has one, please let me know is you have any experience with remote controlling.

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