Armour & Backpacks Hotfix 1

Challenge events will now spawn just before and just after OAs
A bug that allowed Kevlar Vests to have high bonuses to movement speed has been fixed. Any existing Kevlar Vests with this bug will automatically have their +Movement Speed bonus converted to +Health instead as otherwise it would be too overpowered.
Backpack stats have been tweaked to make them more useful
A bug that caused too many of each enemy type to spawn in Challenge Events has been fixed
A bug that made mothers turn invincible has been fixed
A bug that stopped certain enemy types from spawning during Challenge Events has been fixed
Another bug with the way stun time and knockback was calculated has been fixed
A bug with Dusk Mesh hiding backpacks has been fixed
A bug that caused old Hazard Mesh cosmetics to become grey has been sorted.
A bug that caused you to get the wrong OA completion buff has been fixed

NOTE: You will need to quit the game client and install the update on Steam before theses changes take effect. If the game fails to update, logging out of Steam and back in again usually does the trick.