The Issue ¶

If you’re running QGIS 3 master builds on MacOS and notice processing dialog layouts aren’t displaying correctly, the issue stems from the custom designer widgets Python module for QGIS.

Solution ¶

Rename or remove this file:

mv /usr/local/lib/python3.6/site-packages/PyQt5/uic/widget-plugins/qgis_customwidgets.py \
/usr/local/lib/python3.6/site-packages/PyQt5/uic/widget-plugins/qgis_customwidgets.py_

Note: The file location may differ based on your system configuration.

Next Steps ¶

After removing the file, restart QGIS. The dialog layout should display normally again.