This is a really weird one!
I cant see a ruler in my design view of my access any more.
I have not changed any settings that I am aware of.
This is what is looks like when I am in design view now.
Please let me know if you have encountered this and know a solution.
Right click in the details section and click on Ruler to re-enable it.
You can also go to the Ribbon, under Form Design, Arrange tab, Size and Space button, click Ruler.