# Unity 4.5.1

The Unity 4.5.1 release brings you some improvements and fixes. Read the release notes below for details.

For more information about the previous main release, see the [Unity 4.5 Release Notes](https://unity.com/unity/whats-new/unity-4.5).

## Release notes

### Improvements

- iOS: add support for script debugging over USB

### Fixes

- 2D: Very thin down-scaled textures will now produce sprites correctly.
- 2D: Fixed auto-simplification of sprite meshes. Considerably less vertices/triangles will be generated.
- Editor: Fixed ETC2/ASTC texture display for lower mip levels when the editor is run in DX11 mode
- Graphics: Fixed GUIText not being shown if it only consists of Unicode characters
- iOS: Fixed case of resolution/orientation setting when Unity player takes only part of the screen
- iOS: Fixed Unity Remote touch event queuing under stress conditions
- iOS: Fixed 2D rendering when sprite does not have tangents, but has normals
- iOS: fixed autorotation issues on iOS 8
- iOS: fixed Xcode project build under Xcode6 preview
- iOS: fixed splashscreen misrecognition for iOS Free license users on iPad-only apps
- iOS: fixed corner case of RenderTexture creation
- iOS: fixed lighting being broken while starting in landscape orientation
- Linux/OSX: Fix linear lighting when antialiasing is enabled in upscaled fullscreen mode.
- Linux: Fix initial cursor visibility setting when antialiasing is enabled.
- Linux: Fix asset bundle caching.
- MonoDevelop: Fix to correctly close MonoDevelop when not in focus on OS X. MonoDevelop will no longer prevent logging out.
- OSX: Fix stack trace generation on crash.
- OSX: Fixed PS3/PS4 bluetooth pads crashing editor when run.
- Windows Phone/Windows Store Apps: Unity now correctly marshals Collision2D.relativeVelocity to C# code
- Windows Phone: Fixed clearing splashscreen if camera in first scene has no clear flag
- Windows Phone: Input.gyro.gravity now correctly returns data from orientation sensor
- Windows Phone: Fixed an issue which caused compressed meshes to blink in certain situations
- Windows Phone/Windows Store Apps: Unity will now correctly build player if plugins use .NET 4.5 APIs that are not available in .NET 3.5
- Windows Phone: Input.GetJoystickNames now returns an empty string rather than preventing player build
- Windows Phone/Windows Store Apps: Fixed an issue which caused player crash when Collider2D NonAlloc API variants were used

### Known Issues

- Audio: [Angry Bots] Sound of the rain disappears when it shouldn't
- iOS: 4.5.1 needs Vuforia plug-in to be upgraded to very latest version
- iOS: You won’t be able to enable MSAA/stencil for backbuffer if you use Xcode 6 beta for building final application
- Physics2D: Hinge and Wheel 2D joints start scene as if they were asleep