After starting the application (0.10, seems to be latest version on Mint 18.1), I made a 3d plot x + y. This works fine, but upon trying to input a new expression (say x + y + 2) the app crashes.
Do you have a backtrace? I cannot reproduce.
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I just logged in and am unable to reproduce in the current version as well. I believe when I filed this bug report you could input multiple equations to be graphed at once, and now you are limited to one at a time. You can mark this as resolved.