I have the same issue with the ruler greyed out. I have upgraded my version of Illustrator, restarted my Macbook Pro, and the rulers are still useless. Even though the unit menu appears the units do not toggle. The rulers do not scale when I zoom in or out of my document. The "0" point on the ruler is stationery and I cannot move it with the intersection point. Please help. Do I need to uninstall Illustrator? I have not seen the anomaly in the upper right that Thabby posted. My rulers are stuck in the middle of the page and do not scale, move or toggle at all. Global Rulers is greyed out as in Thabby's first screenshot.
I have the same issue with the ruler greyed out. I have upgraded my version of Illustrator, restarted my Macbook Pro, and the rulers are still useless. Even though the unit menu appears the units do not toggle. The rulers do not scale when I zoom in or out of my document. The "0" point on the ruler is stationery and I cannot move it with the intersection point. Please help. Do I need to uninstall Illustrator? I have not seen the anomaly in the upper right that Thabby posted. My rulers are stuck in the middle of the page and do not scale, move or toggle at all. Global Rulers is greyed out as in Thabby's first screenshot.