korpa commented on issue #10530:
URL: https://github.com/apache/superset/issues/10530#issuecomment-766093280


   > @bkyryliuk If I use
   > 
   > ```
   > FEATURE_FLAGS = {
   >     "THUMBNAILS": True
   > }
   > ```
   > 
   > superset will report error:
   > 
   > ```
   > [2021-01-21 13:30:47,554: INFO/ForkPoolWorker-1] Processing url for 
thumbnail: 85e35616c1758c065a4fc7445f084f9a
   > Init selenium driver
   > [2021-01-21 13:30:47,555: INFO/ForkPoolWorker-1] Init selenium driver
   > Failed at generating thumbnail Instance <User at 0x112e39250> is not bound 
to a Session; attribute refresh operation cannot proceed (Background on this 
error at: http://sqlalche.me/e/13/bhk3)
   > [2021-01-21 13:30:55,431: ERROR/ForkPoolWorker-1] Failed at generating 
thumbnail Instance <User at 0x112e39250> is not bound to a Session; attribute 
refresh operation cannot proceed (Background on this error at: 
http://sqlalche.me/e/13/bhk3)
   > ```
   > 
   > Is this problem related to this PR #10819 ?
   
   I have the same issue with thumbnails. Would be nice to know, if this is a 
bug or if I have a wrong thumbnail configuration. 


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