When using EVR-renderer (under Video > [Video rendering]) and "Enable drawing subtitles under image with EVR renderer" (under Subtitle [Subtitle properties]) being selected, you don't get to see the subtitles?
What kind of subtitles are we talking about?
Suppose it couldn't be a video card (drivers) problem? If your system is a laptop, could you perhaps connect it to an external monitor and verify if the green striped line shows then too? (Alternatively maybe test with a different screen resolution.)