sagenb is installed by pip, which pulls packages from the net; whatever 
comes up as the "stable" version,
gets installed. We used to pin down versions, but don't do this any more.
You can look at the output of 

./sage --pip list

to see what versions you have.
Sagenb explicitly needs the following, as you can see from its setup.py:

install_requires = [
'twisted>=11.0.0',
'flask>=0.10.1',
'flask-oldsessions>=0.10',
'flask-openid',
'flask-autoindex',
'flask-babel'
] 

On Thursday, August 24, 2017 at 2:33:59 PM UTC+1, kcrisman wrote:
>
>
>
> On Thursday, August 24, 2017 at 4:54:48 AM UTC-4, Jori Mäntysalo wrote:
>>
>> On Thu, 24 Aug 2017, Dima Pasechnik wrote: 
>>
>> > although it very well might be due to its dependencies, like flask, 
>> > etc., updated to newer versions, e.g. for the purpose of python3 
>> > compatibility. 
>>
>> OK. What packages or parts have been updated lately? 
>>
>
> See perhaps https://trac.sagemath.org/ticket/22431 or 
> https://trac.sagemath.org/ticket/23066 though I don't see immediately 
> which packages were upgraded there. 
>

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