I'm relatively new to CityEngine, so I'm likely doing something a bit newbie-stupid, but...I can't seem to get the 'Align shapes to terrain' icon to become active (or select it from the 'Shapes' drop-down). This was working absolutely fine in my scene previously, but I upgraded to CityEngine 2019 today so I'm wondering if that's something to do with it? Interestingly, most options in the 'Shapes' menu are also greyed out. I've tried it in a completely fresh project (not the one I've imported from 2018.1) and still no luck.
Could somebody tell me what I'm doing wrong please?