HI Adam,
Sorry, but it defies all logic. There is no consistency of selection. Sometimes the red frame and arrow show up, but then when I try to mouse over a different cell, it's impossible to select it.
3 of us here tried this and gave up in frustration.
This is just not working. It should be that the proper arrows up/down left/right appear when you move to a cell's borders. This whole idea of a single drag is not working for a text editing/word processing environment.
FredD