Style dialog: page names become unreadable.
OS: Windows 10 (10.0), Arch.: x86_64, MuseScore version (64-bit): 18.104.22.16831, revision: f6e41c3
Open the Style dialog, click on any of the page names in the list, then click on a text box on the right of the window.
Result: The page name turns black and becomes impossible to read. This affects the various Text Style names as well.