Cant start flint if opencv is installed in bliss env
qt.qpa.plugin: Could not load the Qt platform plugin "xcb" in ".../lib/python3.8/site-packages/cv2/qt/plugins" even though it was found.
This application failed to start because no Qt platform plugin could be initialized. Reinstalling the application may fix this problem
https://github.com/opencv/opencv-python/issues/736
See https://forum.qt.io/topic/119109/using-pyqt5-with-opencv-python-cv2-causes-error-could-not-load-qt-platform-plugin-xcb-even-though-it-was-found/7 for fix details:
pip install opencv-python-headless
Edited by Stuart Fisher