Hi,
Could you please specify which SDK and which version of the SDK you are using?
The TX300 generates large amount of calibration data. There used to be a maximum size limit on the calibration data in the Tobii Gaze SDK that was not enough for the TX300 and made the SDK crash. The allowed size was increased about a year ago and the updated limit is included in the latest version of the Tobii Gaze SDK available here on the Developer Zone.