Thanks for your replies. I was able to sort it out by choosing different models. It only seemed to be an issue using files from the manufacturer of the product (Kino Flo lighting)

I am using SU Pro 2018 for Mac. I've been downloading some lighting instruments and other files from 3D warehouse and having issues with positioning them. When I use rotate tool to turn them they snap back to position they were in when downloaded directly into model. Has anyone else had this issue and resolved it?

Thanks much for any input.