PLEASE NOTE: this update fixes the primary crash issue present in Patch 4, and therefore Patch 3 has been retired. If you had previously rolled back to Patch 3, please ensure that you are no longer opted into any Betas in the Betas tab of the Steam Client Properties page for BioShock Infinite, and then restart your Steam client.

CHANGES INCLUDED IN PATCH 5

Fix for a memory leak that caused crashing on some systems after playing for an extended period of time.
Fix for the game occasionally using an invalid refresh rate and/or resolution on computers with multiple graphics adapters. On some machines this corrects an issue wherein the game shows only a black screen at startup or when switching into full-screen mode.
Level loading time improvements.