(856901) - GI: Fixed a crash while baking lightmaps with custom shaders after Light Transport jobs finished.
(865062) - Graphics: Changes made to blending mode via shader properties are no longer ignored in Graphics.Blit.
(728324) - Graphics: D3D9 to make sure that internal resolves don't result in a drawn pixel, i.e. single white pixel when using deferred mode.
(865491) - Graphics: Fixed an issue with BC6 decompression and improve reading of textures with more than one byte per channel.
(863954) - Graphics: Fixed the issue of forward-only objects being rendered into Depth/DepthNormals textures multiple times when they have multiple submeshes and deferred shading is used.
(862473) - Graphics: For script created/instanced cameras only add Image Effects Callbacks if the Image Effect is already registered. Fixed the error message when disabling script during instantiate.
(849424) - Graphics: On DirectX avoid presenting a fresh-black frame whilst performing screen resizing.
(863625) - Graphics: Set the ambient probe for the deferred reflections pass to fix a difference between graphics jobs and non-graphics jobs rendering.
(876162) - Graphics: Stop RenderNow/DrawMeshNow crashing when shader had no matching vertex channels.
(868016) - Graphics: When calling Material.SetFloatArray, SetVectorArray, SetMatrixArray throw a NULL exception instead of crashing.
(869696) - IL2CPP: Fixed the incorrectly managed stack traces on iOS devices in release mode.
(837679) - iOS, Android: Fixed - Light Probe Proxy Volumes don't fallback to normal probe blending.
(878783) - Mac Editor: Fixed the crashes while exporting projects.
(871026](https://issuetracker.unity3d.com/product/unity/issues/guid/871026)]) - Metal: Fixed geometry corruption when dynamic batching was enabled.
(none) - Metal: Fixed issues with setting DontCare load flag when running multithreaded.
(881491) - Mono: Fixed rare issue due to timer collisions.
(750307) - Shaders: Fixed advanced blend operations by requiring the shaders to be decorated with UNITY_REQUIRE_ADVANCED_BLEND(mode) declaration.
(877123) - Shaders: Make shader binary blob data deterministic to fix problems with asset bundle (or player data) changing with identical source inputs.
(871606) - Shadows: Allow 2k shadowmap textures on devices with less than 2 GB of RAM when best quality shadows are selected
(863256) - Sprites: Fixed an issue where OverrideGeometry on instantiated sprites produced differing results in the Editor and Standalone
(864935) - Terrain: Fixed an issue where the default material could be more specular than expected.
(870830) - Texture Importer: Fixed an issue where a texture's colour model was set to RGBA without an alpha channel.
(858502) - Texture Importer: Fixed an issue where BC7 didn't compress alpha textures correctly.
(856584) - Texture Importer: Fixed an issue where setting textureType reset sprite mode to single.
(858460) - Texture Importer: Fixed an issue where some textures were wrongly interpreted as single channel cube maps.
(873678) - UI: Fixed an occasional masking issue when using deferred rendering path on Linux.
(856380) - UI: Fixed scrollrect performance being slow when it had a lot of content.
(861736, 872634) - UI: Selection elements will update selection state when interactable is changed.
(none) - UnityAds: Fixed callback executor from being destroyed on scene changes.
(850239) - VCS: Fix for editor not checking out scene file before first write in freshly loaded project.
(none) - VCS: Fixed an issue trying to add files from ProjectSettings folder to Version Control even if they were already under Version Control.
(855985) - WebGL: Fixed "incorrect header check" builtin web server error when build folder contained non-URI characters.
(865630) - WebGL: Fixed buffer overflow that occurred when using UnityWebRequest and custom DownloadHandlerScript.
(868756) - WebGL: Fixed memory corruption when generating terrain base map textures.
(none) - Windows Store: Fixed the known issue reported in the previous release, 5.5.2 - player prefs might get corrupted on Windows 8.1 and Windows Phone 8.1 SDKs when forcefully closing the application right after saving them.