Hi

I've only just started using AutoCAD 2015 for Mac and noticed only the other day that the inquiry distance function has stopped wotking.

Whenever I try to measure a distance, it asks me to enter an option (distance, radius, angle, area etc.), and when I click Distance, it asks me to specify first and then second point again, and then enter an option again, and so on. I really don't know what has happened, any help would be greatly appreciated! 

Please help