# Kernel crashes while creating plot in manipulate?

**URL:** <https://community.wolfram.com/t/kernel-crashes-while-creating-plot-in-manipulate/16871>\
**Category:** Questions\
**Tags:** graphics-and-visualization, interface-construction\
**Created:** [October 14, 2020, 9:58am UTC](https://community.wolfram.com/t/kernel-crashes-while-creating-plot-in-manipulate/16871 "2020-10-14T09:58:03Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![wielaerts](https://avatars.discourse-cdn.com/v4/letter/w/3bc359/32.png) [@wielaerts](https://community.wolfram.com/u/wielaerts)\
**Post date:** [October 14, 2020, 9:58am UTC](https://community.wolfram.com/t/kernel-crashes-while-creating-plot-in-manipulate/16871/1 "2020-10-14T09:58:03Z")

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I wanted to make a manipulate where an ellips is moving if I move a point (p1 and p2). I calculate in a function the ellips and some points of it and return points in a list. The input values of the function are  
the variables of the manipulate. I tested the function before, everything seems OK.  
If I use the list of points (I hope they are dynamical) in the manipulate (the last in the notebook) the kernel crashes. I have a error message: An unknown box name (ToBoxes) was sent as the BoxForm for the expression. Check the format rules for the expression.

I added a notebook with comments. I hope someone will have the time to look. I tried already a couple of days.

Many thanks.  
Wiel

[Open in Wolfram Cloud ↗](https://www.wolframcloud.com/obj/5bdd8ea8-e03c-4182-9c06-5f5730f5ad65)

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**Author:** ![rohitnamjoshi](https://avatars.discourse-cdn.com/v4/letter/r/f1d935/32.png) [@rohitnamjoshi](https://community.wolfram.com/u/rohitnamjoshi)\
**Post date:** [October 15, 2020, 12:48am UTC](https://community.wolfram.com/t/kernel-crashes-while-creating-plot-in-manipulate/16871/2 "2020-10-15T00:48:34Z")

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Crash reproduced on “12.1.1 for Mac OS X x86 (64-bit) (June 19, 2020)”. You should report this to [Wolfram Support](https://www.wolfram.com/support/contact/email/?topic=feedback).

Works in the Wolfram Cloud version “12.1.2 for Linux x86 (64-bit) (September 9, 2020)” and cloud version “1.56 (September 30, 2020)”