### Known Issues in 2017.4.38f1

*   Asset Bundles: Loading.LockPersistentManager object lock impacts performance during AssetBundle.LoadAssetAsync operation ([827299](https://issuetracker.unity3d.com/issues/loading-dot-lockpersistentmanager-object-lock-impacts-performance-during-assetbundle-dot-loadassetasync-operation))
    
*   iOS: Apps with UIApplicationExitsOnSuspend in info.plist failing to pass Apple Store validation ([1160614](https://issuetracker.unity3d.com/issues/ios-apps-with-uiapplicationexitsonsuspend-in-info-dot-plist-failing-to-pass-apple-store-validation))
    
*   uGUI: RectTransofrm resets it's coordinates to zero when selecting "Apply" on prefab even if no changes were made ([964111](https://issuetracker.unity3d.com/issues/recttransofrm-resets-its-coordinates-to-zero-when-selecting-apply-on-prefab-even-if-no-changes-were-made))
    

### 2017.4.38f1 Release Notes

#### Fixes

*   Android: Fixed an issue where a settings.gradle file in the Unity project folder could cause build errors. ([1164013](https://issuetracker.unity3d.com/issues/android-gradle-build-fails-when-theres-a-settings-dot-gradle-file-in-the-project-folder))
    
*   Android: Fixed poor physics performance on ARM64 on certain devices with power mode disabled. ([1186295](https://issuetracker.unity3d.com/issues/a-build-runs-at-a-very-low-fps-from-3-to-5-fps-on-huawei-mate-20-pro-when-the-project-is-built-with-64-bit-architecture))
    
*   Android: Fixed problem with platformBuildVersionCode and platformBuildVersionName in manifest ([1118325](https://issuetracker.unity3d.com/issues/android-android-manifest-contains-incorrect-values-for-platformbuildversioncode-and-platformbuildversionname))
    
*   Audio: Fixed TempJob allocation warnings when using Timeline with AudioSource. ([1141919](https://issuetracker.unity3d.com/issues/applying-audiosource-with-timeline-causes-a-jobtempalloc-warning-on-play))
    
*   Graphics: Fixed issue where "GetGfxDevice() should only be called from main thread" errors are thrown and crashes in Play Mode later on. ([1181825](https://issuetracker.unity3d.com/issues/editor-crashes-after-throwing-getgfxdevice-should-only-be-called-from-main-thread-errors))
    
*   iOS: Fixed an issue where a custom storyboard might not be found at runtime ([1225171](https://issuetracker.unity3d.com/issues/2018-dot-4-a-grey-screen-fades-in-between-the-storyboard-launch-screen-and-the-first-unity-scene))
    
*   iOS: Launch Screen storyboards are validated to ensure that they have the correct settings to be used as a launch screen. ([1212014](https://issuetracker.unity3d.com/issues/ios-application-crashes-on-launch-if-storyboard-is-used-as-launch-screen))
    
*   iOS: No longer include code using AdSupport unless user explicitly uses api that needs it. (1219457)
    
*   Player: Fixed a crash caused by unloading a GameObject whose transform has a persistent parent. ([1169647](https://issuetracker.unity3d.com/issues/loading-and-unloading-additive-scene-calling-resources-dot-unloadunusedassets-spawning-a-prefab-on-a-new-scene-causes-crash))
    
*   XR: Fixed crash due to missing WorldAnchor store managed class in non-UWP players. (1212118)
    
*   XR: Recentered the Headset when Oculus' Reset View is called from the OS. (1159322)