Thanks Tom, your response provided an extremely useful clue. I think it came down to a reduced set of fonts installed on my system. Title 3D would sometimes not have a font selected upon opening, displaying just a hyphen (-) in the drop down menu instead of (say) the first font in the list.
Another problem I had was your sample sequences for Lesson 7 would crash the system too, which I subsequently figured was because the Arial font you used wasn’t installed. In any case, with Arial now installed, and ensuring a font is actually selected in Title 3D, I’m back in business.
Thanks again for your help.
Flighter