There is a bug whereby in Day 3 you may come across an error that "Question" is either not defined or not defaulted, or "Fleurquestion" is not defined.
This is caused by an error on my part of originally trying to use "Question" as a flag, which cannot be done as it is part of Ren'Py's own coding. In the release of v.01 this wasn't a problem as although the flag was there it was unused. In Day 3 it can cause an issue though if it is called upon.
Either a Ren'Py Grey Screen or you miss the x55 Content regarding Fleur and "The White Company" despite having selected the Marriage Certificate as the suspicious document in v.01.
If you have seen the x55 Content or you did not select Marriage Certificate you will not have this bug and don't need to do anything.
How to fix:
The flag is set when you open Ellie's email on Day 2 to look at the different documents. If your save is a v.01 save and beyond this point, "Question" will be set. What you need to do to fix this:
Rollback the game to before you open the email. Create a new save. Exit and reload the game. Open Ellie's email. It will now use the new script and set "Fleurquestion" instead and you will not have any problems.
If you cannot rollback your save, you need to restart, use tab to skip the text back to the point you were at.
Future problems if you ignore it:
You will not have access to the x55 content which provides a big clue to helping Lydia's case.