Us can’t figure it out

Mark Ruffalo and maybe Amy Adams have dropped out of Greenburg, a film written, film and directed by Noah Baumbach set for release in 2010. Ben Stiller will replace Ruffalo. A search for Amy Adam’s replacement is underway. Us Magazine says:

It is unclear why Ruffalo — whose brother, Scott Ruffalo, passed away late Monday from a self-inflicted gun shot wound to the head — backed out of the project.

I couldn’t figure out why Mark backed out either. Was it the money? Or was it the thing that Us mentioned in the middle of their report? Big mystery, people.