I am using Excel 15.8.1, and most things are fine.
However, in a spreadsheet, highlighting a row, and pressing "ctrl -" deletes the row with no problem. In Excel 14.4.8 if I press "ctrl +" it inserts a row, but in Excel 15.8.1 pressing "ctrl +" does nothing. If I press "ctrl shift 0", i.e. "ctrl =" it works fine. I am on a MacBook Pro, Yosemite 10.10.3, and my Input Source is set for Danish Keyboard.
Obviously a bug...