Re: Week with director, uncompensated?
I hear you.
That being said, if they can't pay you, find a way to do the rewrite anyway. Stay involved, develop your relationship with the director, and it's fine to draw a line in the sand about the money, but don't let that poison your collaborative relationship with the director.
A project of mine appears to be coming back to life for no reason other than that a director I worked with in the past has some fresh heat and wants to take it to some new companies.
Communicate to your managers that the problem is "I'm super excited to work with this guy, want to do everything I can to help, but I literally can't afford to take the time off work."