1. Autoload data stores breaks grids that are not rendered. For example if you have a grid in a card layout and it hasn't been rendered yet. The view attaches a listener to store load that calls "scrollToTop". scrollToTop throws an exception because ownerCt is not defined.
2. Grids now throw an exception when closed:
ext-all-debug.js:47874 Uncaught TypeError: Cannot read property 'scrollWidth' of undefined