Fix for Xamarin application stopped bug documented here: https://forums.xamarin.com/discussion/10159/can-no-longer-run-android-applications-using-xamarin-4-2-and-xamarin-android-4-10-1 diff page: https://www.diffchecker.com/4Hs0Ltle

project.csproj

<-- I have also created a diff for this against the default csproj file generated when a new application is created.
    Here it is: https://www.diffchecker.com/4Hs0Ltle
    Note that this also solved the Material UI crash problem for me -->

<?xml version="1.0" encoding="utf-8"?>
<Project DefaultTargets="Build" ToolsVersion="4.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
  <PropertyGroup>
    <Configuration Condition=" '$(Configuration)' == '' ">Debug</Configuration>
    <Platform Condition=" '$(Platform)' == '' ">AnyCPU</Platform>
    <ProjectGuid>{F93EB74C-EEA9-4789-9DAB-5974B229E707}</ProjectGuid>
    <ProjectTypeGuids>{EFBA0AD7-5A72-4C68-AF49-83D382785DCF};{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}</ProjectTypeGuids>
    <OutputType>Library</OutputType>
    <RootNamespace>yourAppName</RootNamespace>
    <AssemblyName>yourAppName</AssemblyName>
    <TargetFrameworkVersion>v6.0</TargetFrameworkVersion>
    <AndroidApplication>True</AndroidApplication>
    <AndroidResgenFile>Resources\Resource.designer.cs</AndroidResgenFile>
    <AndroidResgenClass>Resource</AndroidResgenClass>
    <AndroidManifest>Properties\AndroidManifest.xml</AndroidManifest>
    <MonoAndroidResourcePrefix>Resources</MonoAndroidResourcePrefix>
    <MonoAndroidAssetsPrefix>Assets</MonoAndroidAssetsPrefix>
    <AndroidUseLatestPlatformSdk>False</AndroidUseLatestPlatformSdk>
    <AndroidTlsProvider></AndroidTlsProvider>
  </PropertyGroup>
  <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Debug|AnyCPU' ">
    <DebugSymbols>true</DebugSymbols>
    <DebugType>full</DebugType>
    <Optimize>false</Optimize>
    <OutputPath>bin\Debug</OutputPath>
    <DefineConstants>DEBUG;</DefineConstants>
    <ErrorReport>prompt</ErrorReport>
    <WarningLevel>4</WarningLevel>
    <AndroidLinkMode>None</AndroidLinkMode>
	<EmbedAssembliesIntoApk>false</EmbedAssembliesIntoApk>
  </PropertyGroup>
  <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Release|AnyCPU' ">
    <DebugSymbols>true</DebugSymbols>
    <DebugType>pdbonly</DebugType>
    <Optimize>true</Optimize>
    <OutputPath>bin\Release</OutputPath>
    <ErrorReport>prompt</ErrorReport>
    <WarningLevel>4</WarningLevel>
    <AndroidManagedSymbols>true</AndroidManagedSymbols>
	<EmbedAssembliesIntoApk>true</EmbedAssembliesIntoApk>
    <AndroidUseSharedRuntime>false</AndroidUseSharedRuntime>
	<EnableProguard>true</EnableProguard>
    <AndroidCreatePackagePerAbi>true</AndroidCreatePackagePerAbi>
  </PropertyGroup>
  <ItemGroup>
    <Reference Include="System" />
    <Reference Include="System.Xml" />
    <Reference Include="System.Core" />
    <Reference Include="Mono.Android" />
    <Reference Include="Xamarin.Android.Support.v4">
      <HintPath>..\packages\Xamarin.Android.Support.v4.23.1.1.0\lib\MonoAndroid403\Xamarin.Android.Support.v4.dll</HintPath>
    </Reference>
    <Reference Include="Xamarin.Android.Support.v7.AppCompat">
      <HintPath>..\packages\Xamarin.Android.Support.v7.AppCompat.23.1.1.0\lib\MonoAndroid403\Xamarin.Android.Support.v7.AppCompat.dll</HintPath>
    </Reference>
  </ItemGroup>
  <ItemGroup>
    <Compile Include="MainActivity.cs" />
    <Compile Include="Resources\Resource.designer.cs" />
    <Compile Include="Properties\AssemblyInfo.cs" />
  </ItemGroup>
  <ItemGroup>
    <None Include="Resources\AboutResources.txt" />
    <None Include="Properties\AndroidManifest.xml" />
    <None Include="Assets\AboutAssets.txt" />
    <None Include="packages.config" />
  </ItemGroup>
  <ItemGroup>
    <AndroidResource Include="Resources\layout\Main.axml" />
    <AndroidResource Include="Resources\values\Strings.xml" />
    <AndroidResource Include="Resources\mipmap-hdpi\Icon.png" />
    <AndroidResource Include="Resources\mipmap-mdpi\Icon.png" />
    <AndroidResource Include="Resources\mipmap-xhdpi\Icon.png" />
    <AndroidResource Include="Resources\mipmap-xxhdpi\Icon.png" />
    <AndroidResource Include="Resources\mipmap-xxxhdpi\Icon.png" />
  </ItemGroup>
  <ItemGroup>
    <Folder Include="Resources\drawable\" />
  </ItemGroup>
  <Import Project="$(MSBuildExtensionsPath)\Xamarin\Android\Xamarin.Android.CSharp.targets" />
</Project>