UPDATE!
We have just released Preview 3 for 4.10! Thank you for your continued help in testing the 4.10 build before its official release. As a reminder, the Preview builds are for testing only, and should not be used for the active development of your project. Please view the Known Issues List on page 1 of this thread for the updated list of known issues.
Cheers!
Fixed in Preview 3 - CL 2742829
Fixed! UE-22125 VC Runtime not in UnrealLightmass temp directory; causing lightmass build errors
Fixed! UE-22260 Attempting to connect to Perforce source control causes a crash
Fixed! UE-22538 Editor crashes deleting an element in an array
Fixed! UE-22075 [CrashReport] Crash on compile when nodes use same name - FPersistentFrameCollectorArchive::operator<<()
Fixed! UE-22561 Crash launching for distribution Android packages
Fixed! UE-22334 Event On Animation Finished for UMG does not fire off until a few seconds after the animation in complete
Fixed! UE-22565 Crash after splash screen loads on mobile and Linux
Fixed! UE-22200 Editor Crashes when duplicating ‘TM-MovieRendering’ and then trying to open the duplicate Map.
Fixed! UE-22044 GearVR for Distribution builds crash on launch
Fixed! UE-22395 KiteDemo has Launch on crash and can’t be packaged for Windows
Fixed! UE-22326 Spawning an AI Controller in a Character and then possessing that AI Controller on Event Unpossessed crashes the editor
Fixed! UE-22336 Crash removing function input in parent after deleting an override of it.
Fixed! UE-22377 Landscape Components No Longer Editable after Undoing Component Deletion
Fixed! UE-22543 build.xml failure on Android during package/deploy
Fixed! UE-21969 Linux viewport has odd pattern
Fixed! UE-22150 2D objects flicker on the Linux machine
Fixed! UE-22142 Sky sphere flickers on the Linux machine
Fixed! UE-22402 Missing AndroidPluginLanguage.cs entry in UnrealBuildTool.csproj
Fixed! UE-22472 CrashReporterClient (and possibly other programs) cannot be built in 4.10
Fixed! UE-21351 XBOX ONE: Rendering issue on for any project launched on Xbox one
Fixed! UE-22338 Fixes for analytics event for abnormal editor termination
Fixed! UE-21892 Improve how Engine analytics are handled for Editor and games
Fixed! UE-22331 ShooterGame fails to package from EC for Mac
Fixed! UE-21826 Mask not being properly rendered on Morpheus
Fixed! UE-22332 Lighting needs to be rebuilt in StrategyGame
Fixed! UE-22604 Large memory spikes in cooked games when doing async loading
Fixed! UE-22370 The wrong ANDROID_HOME is used if more than one in .bash_profile on Mac
Fixed! UE-22364 Some Android device profiles are incorrectly parentyed
Fixed! UE-22345 GitHub Editor generated with -2015 creates code projects with VS 2013
Fixed! UE-22306 increase submission count to go with smaller DCB blocks.
Fixed! UE-22082 Actionable UBT error message if 2015 C++ toolchain is missing
Fixed! UE-21935 Landscape does not render in Layer Debug visualization
Fixed! UE-21966 Effects map missing from ContentExamples
Fixed! UE-22168 Build: Getting a compile failure using VS2k12 to build UE4 (Debug Editor/Win64 config) in current 4.10 release branch.
Fixed! UE-22434 Splash Screen reversed on some devices
Fixed! UE-22547 ModuleRelativePath Metadata is not properly generated for structures
Fixed! UE-20537 Particles_Intro examples have default material
REMEMBER: Please report any new bugs you find to the UE4 Answerhub