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Cura crash on Mac

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I've just started using my Ultimaker, driven by a Mac Mini server running 10.8 latest.

Cura is doing strange things. I've done some successful small builds and have been tweaking the settings.

Cura has completely locked up twice now whilst running a larger build; unfortunately it was over 90 minutes into the build each time (and only a few minutes before the end both times!). The CPU for Cura went to 100%, the motor still kept moving, but the heater went off so it stopped extruding and caused a right mess as the extruder was still pushing.

Cura has not resumed, I just had to kill the process, it was running at 50-100%. In addition, this left an odd "kernel task" running at 50% - perhaps this is some sort of USB buffering?

Should I abandon the Mac version of Cura, or is there a known problem? I can run the machine off a PC as well, but its less convenient.

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