Amanda White, a producer on Affleck's upcoming documentary I'm Still Here, has filed a $2 million (£1.3 million) sexual harassment lawsuit against the star, alleging she endured "uninvited and unwelcome sexual advances in the workplace" while making the movie.
On Monday (09Aug10), White was due to submit her opposition brief to a request Affleck's lawyers made last month (Jul10) to move the case away from the court system and into arbitration.
But the deadline has now been pushed back until 9 September (10), according to Reuters.
No reason was given for the postponement but the decision has sparked speculation both parties are discussing a settlement.
The new deadline falls just one day ahead of the U.S. release of the documentary, which follows actor Joaquin Phoenix's attempts to launch a rap career.
A second woman involved in the production, cinematographer Magdalena Gorka, has also filed a separate sexual harassment lawsuit against Affleck. His attorney has denied all allegations of bad behaviour.