Hey, this causes errors if you are running from source and using PyQt5 (PySide2 is fine)! All the releases above are PySide2, so they are ok! I will fix this for next week, so if you are source+QtPy5, please hold off for now.
I had a great week overhauling the media viewer's image rendering. Zooming and navigation should be a lot smoother now!
image tiles
tl;dr: the media viewer now zooms and navigates with less lag and flicker