Since Modeling 18.1 the viewport setting invert elements no longer works for the CoCreate Color scheme. (It still works for the Creo Color scheme). This implicates that black lines are no longer inverted to white lines in annotation. This can make a drawing a lot harder to read.
This problem manifests itself when ancient drawings containing black geometry lines are opened in modeling 18.1 and is especially problematic when black lines are used in titlecorners and text. (See images below).
I hope this setting is reactivated in a new date code of Modeling as to me this is a necessary setting.