I was running v6.06 when it happened, I have just upgraded to v6.06b and will try it again. I will also try the logging thing, but if it locks there is very little I can do unfortunately.
Re the q3a thing, I think I downloaded the wrong version, I was thinking it was the demo but obviously it wasn't. Another 30 meg download was just beyond me at the time.
I'll report back with the findings, thanks for the suggestions