5 votesTorsten Hielscher commented
Thanks for your comments and replying to the same issue.
Since Adobe couldn't give support maybe it's a little bit helpful for you to know: On my side the error is only appearing when activate overprinting preview. So if you also activate the ruler then the thin line disappears. Thats not fine but it helps to proof the quality of the design without interruptions.
That's how it works for me.
But this is still no workaround for presenting designs on screen direct from InDesign to customers, colleagues etc. :(
I hope Adobe will take a look at the problem soon.Torsten Hielscher commented
Thanks for your comment, Daryl! After a new cc-2019-update I was thinking "yeah, the probem was solved". But after different test with different files I figured out that the error is still existing. Maybe Adobe can check this problem once again?