I've scoured the web looking for a solution to this issue, but no luck yet -- I've been successfully using Excel 2010 for months now and just today the cursor behavior changed (I have no idea what I did). When I select a cell, there is no selected cell border displayed. I can put my mouse in a cell and type and the values show up. I can select a range of cells or a row or column and apply, for example, cell highlights. But I cannot SEE what I am selecting because the cells are not highlighted for me. I would expect a border to be drawn around the selected cell(s). It is very annoying to drive blindly in excel. Any tips?