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Cura 3.6 has stopped slicing

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I have encountered a problem with Cura 3.6 on Ubuntu.

I have been using it (and previous versions) for over a year and it has been working beautifully.

However, I opened it yesterday and everything works fine until it starts slicing, when it stops (with no messages) about a quarter of the way through. Slicing time stays at 0:00, I can't save the file and it just stays there no matter how long I leave it open. I have attached a screenshot.


I uninstalled Cura, removed all config and related files I could find, reinstalled it and the same thing is happening.

Does anyone have any ideas?

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