MSBuild post build events not running in windows 10 - visual-studio

Question

I've upgraded to a new windows 10 development machine.
Everything works great, except post-build events in msbuild/visual studio.
This is for any project, new or existing.
They all work fine on other people's windows 7 machines.
They work fine on the build server (jenkins).
They do not work for me at all, either in visual studio or with msbuild.
PRE-build events works fine.
It's like the postbuild event isn't even defined.
Unfortunately, our postbuild events are fundamental to the build process.
Starting with a basic console app and configuring the build events as:
<PropertyGroup>
<PreBuildEvent>echo before build</PreBuildEvent>
</PropertyGroup>
<PropertyGroup>
<PostBuildEvent>echo after build</PostBuildEvent>
</PropertyGroup>
The build output is literally:
1>------ Rebuild All started: Project: ConsoleApplication1, Configuration: Debug Any CPU ------
1> before build
1> ConsoleApplication1 -> C:\dev\postbuild\ConsoleApplication1\ConsoleApplication1\bin\Debug\ConsoleApplication1.exe
========== Rebuild All: 1 succeeded, 0 failed, 0 skipped ==========
Running msbuild with /v:diag I get this section:
PostBuildEvent = echo after build
PostBuildEventDependsOn =
PreBuildEvent = echo before build
PreBuildEventDependsOn =
When running prebuild:
Target "PreBuildEvent: (TargetId:22)" in file "C:\Program Files (x86)\MSBuild\14.0\bin\Microsoft.Common.CurrentVersion.targets" from project "c:\dev\postbuild\ConsoleApplication1\ConsoleApplication1\ConsoleApplication1.csproj" (target "CoreBuild" depends on it):
Using "Exec" task from assembly "Microsoft.Build.Tasks.Core, Version=14.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a".
Task "Exec" (TaskId:19)
Task Parameter:WorkingDirectory=bin\Debug\ (TaskId:19)
Task Parameter:Command=echo before build (TaskId:19)
echo before build (TaskId:19)
before build (TaskId:19)
Done executing task "Exec". (TaskId:19)
Done building target "PreBuildEvent" in project "ConsoleApplication1.csproj".: (TargetId:22)
When running PostBuild:
Target "PostBuildEvent: (TargetId:77)" in file "C:\Program Files (x86)\MSBuild\14.0\bin\Microsoft.Common.CurrentVersion.targets" from project "c:\dev\postbuild\ConsoleApplication1\ConsoleApplication1\ConsoleApplication1.csproj" (target "CoreBuild" depends on it):
Done building target "PostBuildEvent" in project "ConsoleApplication1.csproj".: (TargetId:77)