What is the key combination for typing a next line rather than a next paragraph?
eg, in MS Word it is shift-return rather than return.
Opt-Cmd-Return. If I recall correctly, Shift-Return is used by something else on the system, so it was conflicting—or it might have been hard to detect; one of those two.
Ioa, it’s almost 9pm in Sydney so it’s gotta be about 2am where you are!
Now, that’s dedication to the cause 
Thanks once again for your timely advice. I’ve programmed my system to enter Opt-Cmd-Return whenever I hit Shift-Return in Scrivener… old habits die hard.
I’m starting to get my head around the Compiler… so by 2am my time… 
Just a few more paragraphs to go and this infernal PDF will be mostly done.
Ha, shift-return was a support nightmare! I changed Scrivener so that shift-return entered a line break rather than a paragraph break in 1.50, and changed it back in 1.53 or 1.54. You would not believe how many users were entering line breaks accidentally. It turns out that a lot of typists already have the shift key held down in preparation for typing the capital letter that will start the next paragraph as they hit return to move to that paragraph. I lost count of the number of support incidents I had with users ending up with messed up formatting because they had entered line breaks throughout their projects instead of paragraph breaks. Presumably users have been doing this for years in Word, too, but the difference isn’t obvious in Word. However, exporting from Scrivener to RTF and then opening in Word does show an obvious difference between line breaks and paragraph breaks, and so users would compile and then wonder why everything was messed up, why styles in Word were getting applied across multiple paragraphs and so on.
So it turns out that it’s not always best to match Word’s key combos.
That explains it! … why I get sent texts to edit which show a random application of line breaks and paragraph breaks; all done in Word and by people occasionally being too fast on the draw with the shift key. And since they are generally so incompetent at using a word-processor properly, they probably don’t even know that you can turn invisibles on, so they never notice. And Chinese is all monospaced, so they don’t know anything about tabs, styles etc. Sooooo …
All explained. It drives me mad sometimes!
Mark
Sounds like they’re using an IBM Selectric 
Thanks for the explanation KB.