I believe the issue stems from the "AIS2D_ProjShape" method. The issue has come up before...<https://www.google.nl/search?q=site%3Awww.opencascade.org%2Forg%2Fforum+AIS2D_ProjShape&sugexp=chrome,mod=6&sourceid=chrome&ie=UTF-8> Best would be to file a bug on the OCC site... <http://dev.opencascade.org/>
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