Text labels are aligned with the grid according to their height or something in such a way that labels with characters that descend below - like g, j, y, etc are not aligned with those that are don't have such characters. I hope that makes some kind of sense. For example 'File' and 'Login' when snapped to the grid vertically will their their text misaligned vertically. In my pages with text at 12 points I am having to move labels with characters like g down a pixel off the grid every time I move them.