Processing Sentinel 1 data using snappy

I am trying to preprocess Sentinel-1 data with Python. The code is basically identical with the code in the RUS webinar. The processing steps are working without error, but the visualization is crashing. I always get the error message: UnsupportedOperation: seek
It looks like the following:

I tried looking for solutions over internet but couldn’t find anything subsantial.

I’m not sure, but does it have to do with trying to read a zipped PNG file? Try unzipping it first and see if that changes the result. I’m not familiar with the RUS webinar, could you include a link?

I wish I could but my snappy is very buggy and not working again, after repeatedly trying to install it. It works sometimes and the next moment it messes up. Thank you so much for reaching out though!