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First, the scales could be messed up such that the data isn't on the screen.
Second, check the data that's being sent to the graph. If there is an error in the calculations you could be generating an array of NaN (Not a Number)values.
Third, there could ba an error being generated somewhere that you aren't seeing. Make sure all the error clusters are chained together and that the end result is appearing on a front panel somewhere.
Mike...
Certified Professional Instructor Certified LabVIEW Architect LabVIEW Champion
Another suggestion: Right-mouse click on the 3D Graph container and select CWGraph3D >> Properties. A dialog box should appear. Deselect 'Enable dithering' and 'Use 3D acceleration'. If they are already deselected, try selecting them. Click the Apply button and then OK.