When I try to mesh (or simply open) the attached file (.h extension added for forum), Netgen suddenly closes with no error messages. I also compiled Netgen with Open CASCADE Technology 7.3 and ran it through nglib.dll from my own application. It still crashes but with exit code 0xC0000374 (heap corruption?).
Several other files have the same problem and it's intermittent, happening about 50-90% of the time, not every time. They were all working fine in Netgen 4.9 but fail in both 6.2.1808 and 6.2.1802.
Are any of the older versions such as 5.x more stable than 6?
I'm using Windows x64.