When Sorting and Priview
I was searching the explanation of this issue and found it. It is related to the following new option of v12 :
If you deactivate this option on the layout properties, this issue will no longer appear.
Working this in Preview Mode, fill and border will never be printed. What's the deal, bug or behavior ?
It's the new Delineate option in layout setup. Clear it and the issue will not occur. Why Delineate has any effect on the layout when it is previewed/printed/pdf'd escapes me as it forces me to create duplicate layouts--one with this option and one without if I want to use it to help show which record is the current record in a list view.