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We are happy to announce Unity 5.5.3p1. The release notes and the corresponding issue tracker link for issues fixed in this release are as shown below.

As always, patch releases are recommended only for users affected by those bugs fixed in that patch.

Fixes

(871871) - 2D: Fixed an issue with texture compressions when using SpritePacking with '[TIGHT]' texture packing and high quality compression.

(892203) - Android: Fixed an unnecessary internet permission requirement in empty project.

(880724) - Animation: Fixed the mesh distortions during animation if the "Optimize Game Objects" option was selected.

(885258) - Buildpipeline: Fixed an issue with reported texture size being smaller than actual size.

(894074) - Editor: Fixed the issue whereby 'Build and Run' attempted to push a build to device even if error (during the build) was encountered.

(875845) - Editor: Fixed an issue where locking the Inspector on subscene objects caused their disappearance, coupled with a group of 'Failed to unpersist' error messages.

(885492) - GI: Fixed lightmap texture inspector preview being too bright when using linear color space.

(878724) - Graphics: Fixed SceneView GUI elements being very bright when HDR and Linear mode were enabled.

(889138) - Graphics: Fixed a crash in GetBuildUsageTagFromAssets that was triggered by project that had ShaderVariants.

(833583) - Graphics: Fixed an issue on PS Vita causing the default sky to be black.

(888339) - Graphics: Fixed an editor crash on old OpenGL drivers.

(884547) - Graphics: Fixed generating invalid raycasts causing "Invalid AABB b0" error appears in console.

(880716) - Graphics: When graphics jobs are enabled CommandBuffers will not be executed multiple times upon LightEvent.AfterShadowMap.

(891471) - IL2CPP: Implemented RegionInfo.

(none) - Particles: Reinstated random emission modes.

(889321) - Purchasing: Fixed an issue with Unity IAP emitting DuplicateTransaction failure for all non-consumable purchases when initialized.

(none) - Shaders: Fixed a subtle metal shader generation bug in bit field insert operations.

(883080) - Shaders: Fixed an incorrect translation from HLSL assembly for AND and OR operands. Fixes a crash when compiling shaders for GLCore.

(881103) - Shaders: Fixed internal error on a GLSL shader compiling corner case.

(893421) - Shaders: Fixed uint params on OpenGL.

(883721) - SpeedTree: Fixed GPU instancing break when the trees come back into view.

(891365) - TextureImporter: Fixed a bug with some types of PNG files caused the texture importer to not detect the alpha channel properly. (Please re-import the affected assets to fix them.)

(884058) - Windows Store: Fixed a build error "Failed to resolve assembly: 'Windows.Foundation.UniversalApiContract, Version=3.0.0.0, Culture=neutral, PublicKeyToken=null'"." when using default parameters of Windows Runtime types in method signatures and "C# projects" build option on .NET scripting backend.

(869168) - Windows Store: Fixed a build error on .NET scripting backend when a method with name OnMouseDown was defined in a non-monobehaviour class.

(869407) - Windows Store: Fixed a crash when using "SceneManager.UnloadSceneAsync" on .NET scripting backend with .NET native enabled.

(885997) - Windows Store: Fixed a rare build error "Failed to resolve assembly: 'System.Reflection.TypeExtensions, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a'" on .NET scripting backend when using "C# projects" option.

(886049) - Windows Store: Fixed a rare build error "Version not supported: 255.255.255.255" when using certain .winmd plugins and "C# projects" option on .NET scripting backend.

(872058) - Windows Store: Fixed a System.TypeInitializationException on startup with .NET scripting backend when a nested class derived from a non-nested class and was overriding one of its methods.

(855878) - Windows Store: Fixed a crash on certain devices in debug and release configurations when there was no internet connectivity (note: master configurations were unaffected).

(875849) - Windows Store: Fixed Screen.SetResolution not accounting for DPI settings.

Revision: b27954c0d351