Hi, Eugenio, it looks like something went run with the structure in the model or the result file hadn't been fully written out. As I don't know what exact steps you went through, I am not sure what exactly caused it. My suggestion would be have a check of the .MES file and .LIS file to see if there are any useful messages. Also, check your geometry components, Structure Selection, and re-run Hydrodynamic Diffraction and HR stability analysis. If possible, start a new HD and HR to try again. If this continues to happen, please let me know the detailed steps you went through to reproduce this problem. Hope this works.
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