Hot reload not working sometimes

Unfortunately Hotfix 4.15.1 doesn’t work for me. Yeah, false errors in VS now gone away, but hot reload still doesn’t work. I get the same warning in Editor:

LogModuleManager:Warning: ModuleManager: Unable to load module 'D:/Unreal/DbugVarsProject/Binaries/Win64/UE4Editor-DbugVarsProject-229.dll' because the file couldn't be loaded by the OS.
Warning: HotReload failed, reload failed /Script/DbugVarsProject.

In attachment link text you can find my test project. Repro steps:

1)Generate VS project files

2)Open project in VS

3)Compile and launch project

4)Change something in code (for example log in GameMode)

5)Build solution

6)Now you can see warning in editor without any errors and hot reload didn’t work