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Hi Graham,
I had no trouble with the latest version of StarTools (you must be using an old one?), though your data contains a lot 'NaN' entries (pixels without a value), including in the cores of the brighter stars. StarTools interpolates these (instead of making them white or leaving them as gaps), as better results will be obtained by the various algorithms if they have values to work with that lie within the range of neighbouring pixels.
Because your image contains enormous amounts of NaN pixels, interpolation may take a while during loading.
To avoid NaN/ missing values you might want to look into your stacking options - I'd also recommend leaving colour/background calibration off while you're at it, as it will have exacerbated noise before StarTools had a chance to track it. It's nice data though! (heavily oversampled however)
Hope this helps!
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