I seem to have lost the ability to install a power line, pole line or telegraph line with the linear objects tool. And its only those objects. Lofts, bridges, track, fences etc. etc all still activate and follow the linear object tool arrow. I don't get the arrow for the power lines. Have I accidently ticked something. I have tried lines from different route assets to no avail.

No recent downloads or additions to the asset list.
Any thoughts or suggestions appreciated.
George