I have two environments in which spyder just doesn't want to launch. I click the icon there is a waiting cursor then nothing happens. One of the two is totally new that I just made today. After installing some packaged (pip install pytrends was the last one) it stopped opening.
Note: the general spyder at: C:\ProgramData\Anaconda3\Scripts\spyder.exe does launch, but not the one for the environments.
This solves the problem:
conda upgrade qt