The description bug for Monstro's Tooth that was introduced in the last patch was fixed.
Before, the Epic Fetus and Bookworm synergy would result in some missiles not firing. This has been fixed.
Fixed "The Marathon" achievement. This was verified by looking at the internal game disassembly. For people who have done Daily Challenges in the past, you will have to do 5 new Daily Challenges in a row from the date of this patch (or later) in order to get the achievement.
The bug where you could choose between The Polaroid and The Negative on the Pong challenge is fixed.
Certain graphic filters are fixed on the OS X version, including the "B00B T00B" easter egg.
The bug where Judas was unable to obtain the Bookworm transformation is fixed.
The bug where Void could give range downs (on the HUD) is fixed.
The bug where using the Maw of the Void ring could hurt and kill charmed enemies that you're not supposed to be able to hit (such as the leeches spawned by My Shadow, or Delirious bosses) has been fixed.
Before, if you had Humbling Bundle, items would not be doubled the first time you entered a shop. This has been fixed.
Before, when you had the Equality! trinket, all shop items that have double versions would automatically be bought for you. This has been fixed.
The bug where Dataminer caused range downs on the Found HUD has been fixed.
The bug where a Mushroom would appear as a Host for a few frames after spawning from a skull is fixed.
The bug where rocks and other entities would randomly break upon entering a room with an item pedestal is fixed. (This fixes the unavoidable damage in the Treasure Room with TNT barrels.)
The bug where Hush's door would take a key (and open anyway even if you had 0 keys) is fixed.
On Eve, when Whore of Babylon is activated via the Razor Blade, she will turn red instead of having the standard whore costume. This new look only lasts for the current room, so it might be a new bug.
Robo-Baby 2.0 does not unlock anymore after defeating the “Computer Savvy” challenge. Nothing at all happens when you complete the challenge for the first time. (It could also be happening to other challenges as well, but this is unconfirmed.)
For some people, save files are bugged and do not show up.
For some people, the OSX version crashes on startup.