Hi all,  
I wonder if you can help me.  
I run FS9 and I (nearly always) fly the PMDG Boeing 737-700. 
I have a registered copy of FSUIPC running on my computer and I have the Axis Assignments directly controlling the movements of the aircraft.  
I have revently purchased a new joystick (Thrustmaster Hotas X) and at first everything was tickety boo. Today I have come to do a simflight and I powered on the runway and I got to about 20kts and the aeroplane started veering to the left. The more power, the bigger the veer. 
I have FSUIPC controlling all the movements directly and I have deleted all of the axis assignments from FS9 and just can not work out why it is doing this.  
I looked at the joystick calibration and everything seems in order as in the rudder numbers stay idle when the throttle goes up and down.  
A friend of mine talked me through some troubleshooting to no avail and I really am at a bit of a loose end. 
Any help is gratefully appreciated. 
Many thanks in advance.  
Graeme.