The 4.8.3 Hotfix is now live! It contains fixes for 3 crashes and an issue with shipped builds.
Feel free to continue the discussion about this release on the 4.8 announcement thread.
If you experience a bug with the 4.8.3 Hotfix, please remember to log a bug report for the issue on the UE4 AnswerHub to the Bug Reports section.
Fixed in 4.8.3
UE-18668 Crash when closing projects
UE-17342 Crash when exiting PIE after server travel
UE-18530 Assert in ConformComponentsUtils::FindeNativeArchetype
UE-19151 Parallel Rendering is disabled in Shipping builds