I’ve searched to see if there are any references to this but couldn’t find any.
I’m writing in UK stage play and all was going well about 3,000 words in when grey shading suddenly showed up behind the lines of dialogue. I’ve checked the formatting I set which is fine. I’m using general text and scriptwriting. The shading wouldn’t bother me, unless it affects printing, but now, when I press return, it only moves one line down instead of two even though it’s showing 1.0 in the line spacing. It was moving two lines before when I pressed return.
Any advice much welcome.
Are you on a Mac or PC? On Macs programs tend to act a bit strange if you have not rebooted your system in a long time, as in 10 days or more. So if I notice an app acting strange before I do anything else I go into Terminal and type uptime to see how long it has been since I last rebooted. If it has been more than a week then that is usually the culprit and a reboot brings things back to normal.
Have you turned on Preserve Formatting in the Format menu? This would create a blueish grey box around the text.
No, I’ve not turned on Preserve Formatting.
I’m on Mac. I don’t know what you mean by rebooting. Rebooting what?
Yeah, got it. I thought the original poster might have meant reboot Scrivener. 
That
That you should do every day anyway.
Why restart every day? I just put my mac to sleep.
I was obviously talking about Scrivener.
I don’t understand. Do you mean restart Scrivener every day?
Yes. Perhaps better stated as “close Scrivener when you stop writing”. Let it do its things that it does when being closed.
Thanks. Apart from updates what else would Scrivener do that can only be done when it’s closed?
Scrivener does nothing when closed. 
The process of closing certainly (if you set that option) will make a backup of your project. I suspect it does other things as closing is not instantaneous so Scrivener (with the operating system) is doing something. Knowing how computers work, I can think of a few things they might be doing, but that a topic beyond the scope of this thread and frankly I don’t plan to pursue it. I just accept that it does something and when finished writing, I close it. I close other apps when not in use. I have no reason to think it’s not a good practice and in fact it probably is. Your mileage may differ.
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I close down my Macs pretty much every night and start them up again in the morning. (1) Shutting down clears temporary system files and other cruft which can slow the computer down and, if it really builds up, lead to weirdnesses; (2) it’s not consuming electricity overnight when I’m not using it.
Particularly with Apple silicon, start-up is so fast that it has no impact on time usage.
Mark
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But closing the Mac means that any updates won’t get done until you reopen it.
restart Mac every so often.
Scrivener will detect updates when available and running.