1) Thanks for letting me know! This will be fixed from version 0.9.14, most likely.
2) No way to remove traits other than using the debug tool (if you use the "travel sphere" among the key items, and interact with the green sphere, you can toggle traits). Note that since the game isn't built with the idea of traits being removable, if you started a path that required a trait, future scenes in that path might still read as if you have the trait.
As for hiding text, do you mean hide the dialogue box? If so, pressing CTRL toggles the visibility.