Hi Joan, thanks for your response.
Yes, I tested both default and OpenGL Canvas.
OS = Windows 10 Pro 64-bit AMD
Interesting - Murphy's law ? - I'm very excited because it's working today... I played around with that setting again and am able to draw any angle.
Possibly because I rebooted the pc this morning?
Yesterday, when I was playing with it, I only switched the software on and off.
Thank you for your help.