I had a similar issue today using conda on Win10.

I had to remove my conda env and create a new one to solve the issue.

El jueves, 4 de abril de 2019, ferrabras <[email protected]>
escribió:

> There is a problem while upgrading from 3.3.3 to 3.3.4 at qtwebengine that
> requires a certain version of PyQt5. I downgraded spyder to 3.3.0 than
> upgraded to the specific 3.3.4 version. Now it's woring on Python 3.6 and
> 3.7.
> pip install --upgrade==3.3.0 spyder
> pip install --upgrade==3.3.4 spyder
> If I use simply
> pip install --upgrade spyder
> It does not work.
>
>
> Em quinta-feira, 4 de abril de 2019 08:28:41 UTC-3, ferrabras escreveu:
>>
>> I upgraded spyder using pip and it's not lauching anymore. I am using
>> Windows and when I launch spyder3.exe a python and spyder3 instance shows
>> up at Task Manager but then it dies. Is there a way to monitor a error log
>> in some sort of command line. I tried --reset but no joy.
>>
>> Em domingo, 31 de março de 2019 16:12:44 UTC-3, Carlos Córdoba escreveu:
>>>
>>> Hi all,
>>>
>>> On the behalf of the Spyder Project Contributors
>>> <https://github.com/spyder-ide/spyder/graphs/contributors>, I’m pleased
>>> to announce that Spyder *3.3.4* has been released and is available for
>>> Windows, GNU/Linux and MacOS X: https://github.com/spyder-ide/
>>> spyder/releases
>>>
>>> This release comes seven weeks after version 3.3.2 and it adds the
>>> following new features:
>>>
>>>    - Fix several incompatibilities with PyQt5 5.12.
>>>    - Avoid errors when running turtle programs in the IPython console
>>>    multiple times.
>>>    - Avoid the UMR to reload modules installed in the user
>>>    site-packages directory.
>>>
>>> In this release we fixed 13 issues and merged 23 pull requests that
>>> amount to 57 commits. For a full list of fixes, please see our Changelog
>>> <https://github.com/spyder-ide/spyder/blob/3.x/CHANGELOG.md>.
>>>
>>> Don’t forget to follow Spyder updates/news on the project’s website
>>> <https://www.spyder-ide.org>.
>>>
>>> Last, but not least, we welcome any contribution that helps making
>>> Spyder an efficient scientific development and computing environment. Join
>>> us to help creating your favorite environment!
>>>
>>> Enjoy!
>>> Carlos
>>> ​
>>>
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