I am seeing the same error on my laptop with touch screen:

TypeError: a.ui is undefined embedded_sagecell.js:29601:354 
<http://cosmos.mat.uam.es:8888/static/embedded_sagecell.js?v=c433eb421c6ceb30b81e23ddd822cbf4>
 
<anonymous> http://cosmos.mat.uam.es:8888/static/embedded_sagecell.js
:29601:354 
<http://cosmos.mat.uam.es:8888/static/embedded_sagecell.js?v=c433eb421c6ceb30b81e23ddd822cbf4>
 
<anonymous> http://cosmos.mat.uam.es:8888/static/embedded_sagecell.js
:29601:2 
<http://cosmos.mat.uam.es:8888/static/embedded_sagecell.js?v=c433eb421c6ceb30b81e23ddd822cbf4>
 
<anonymous> http://cosmos.mat.uam.es:8888/static/embedded_sagecell.js:1:2 
<http://cosmos.mat.uam.es:8888/static/embedded_sagecell.js?v=c433eb421c6ceb30b81e23ddd822cbf4>
 

On Wednesday, January 2, 2019 at 4:44:39 PM UTC-5, Andrey Novoseltsev wrote:
>
> On Wednesday, 2 January 2019 14:03:31 UTC-7, Robert Beezer wrote:
>>
>> On 1/2/19 12:59 PM, Andrey Novoseltsev wrote: 
>> > That particular 
>> > location is for jquery-touch-punch, perhaps it is triggered only on 
>> devices with 
>> > touch screens like phones? 
>>
>> Bingo (for me) - no problem on desktop Ubuntu/Firefox, not even a textbox 
>> on 
>> reasonably current Andoid/Chrome. 
>>
>
> OK, if this is indeed the source of problem, perhaps getting rid of 
> touch-punch is another option. (Is it really necessary to use such an 
> extension to make jQuery usable on phones???) 
>
> I have started a test server at http://cosmos.mat.uam.es:8888/ with 
> jQuery Migrate plugin - can people who can reproduce the problem check how 
> it works for them and report console error messages? I have eliminated 
> "our" deprecation warnings, but there are some from jquery-ui and perhaps 
> touch-punch will do something too.
>

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