Hi MimeticMouton,
The thing is is that I’m not within a Scrivenings session. This is one single document that happened to keep the dividing line.
Any thoughts?
I’ll try the formatting pane.
Best,
Michael
Hi Michael,
Yeah, sorry if that wasn’t clear. The bug is that switching from the single-line dividers (crop marks) to the standard line dividers when in a Scrivening session will produce the lines appearing in the single documents when not viewing Scrivenings. But I’ve only made it happen so far if I did the switch at some point when a Scrivenings session was open, so if you’re getting the lines just appearing without ever having done that, yours may be a little different. (Or rather, it’s probably a little more info on the same bug.)
The only way so far I’ve gotten it fixed from my bug is to close and reopen the project. But Ioa did suggest checking the text in the Format panes (Scrivener Preferences and Project>Text Preferences) to see if the divider line is showing up in the sample text there; apparently that was an old bug that some people got, and the buggy text then was showing up in the project. If that’s it, you can fix the text there with a clean sample.
Hi MM,
Yeah, I did exactly what you’ve just described. I had been within a Scrivening session with the affected files, then–when I closed the Scrivening session–the dividers were still there. I tried the formatting suggestions (both), but there are no dividers in the mock window, and the default formatting didn’t work.
And ditto here: The only way the documents went back to normal was if I closed the project and reopened.
Hope they can isolate this nasty insect! 
Best, and thanks,
Michael
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Ahh. Yeah, the formatting was fine in mine as well, but in case yours was a different case I wanted to offer it up.
In the meanwhile until the bug is fixed, you can still switch the mark type–just don’t have a Scrivenings session open when you do it. If it was in corkboard or outliner or just a single document view, I didn’t get the lines randomly showing up elsewhere.
Thank you very much MM. I was beginning to think the bug was already fixed and I had some malfunctioning copy. 
Best,
Michael
I’ve reproduced this and will start work on a fix tomorrow.
Thanks,
Keith
I can’t find where to switch the divider lines off and on to save my life… I’m on 2.0.2.
Where am I missing it?
The “Formatting” pane in the Preferences is what you want.
Best,
Keith
Found it, ta.
Is it possible to make the divider setting a project setting which can override the general setting?
For example, I regularly write a bunch of small texts for a monthly, all part of one project. In this case the divider lines are the proper choice, but when working on another project with one big text I prefer the unobtrusive dividing corners.
No, it’s a preference only.
All the best,
Keith