The keyboard navigation seems to stop working if a drag selection begins in checkbox cells.
Steps to reproduce:
1. Start a drag selection within the checkbox cell
2. Drop outside the checkbox cell
3. Note the keyboard navigation no longer works
Here is a jsFiddle:
https://jsfiddle.net/ChaseRLewisAlamode/e185g08d/4/
If the dragging begins in any cell other than a checkbox (as far as I can tell) keyboard navigation continues to work. This is consistent in Chrome Version 55.0.2883.87 . Checkbox cells are the only ones I have editable so it might have something to do with that instead.
Any help on this matter would be appreciated.