There seems to be a weird Grasshopper UI bug or glitch in Rhino 6 (6.17.19211.14112, 2019-07-30), where horizontal or vertical lines interfere with information, displayed while hovering the mouse over a component output.
The bug doesn’t happen all the time though, but frequently.
Thanks for letting us know. I’m not at my keyboard at the moment, so I can’t check it yet. Do you see the same behavior in 6.16? I ask because we updated the embedded Mono and Xamarin.Mac in 6.17 and that might have something to do with it. Or not.