Missing dimensions when sketching

I have recently upgraded to SW2017 and when start a new sketch I cannot add dimensions. the dimension lines are not there and I am unable to click to start a new dimension.

Even when opening old models, there are no sketch dimensions showing.

I do not have Instant 2D turned on, I have the latest graphics card drivers installed and have also reinstalled SW.

Any ideas?

SolidworksDrawings And Detailing