Created Unassigned: "Manage Nuget Packages for Solution" shows already installed packages [3302]

I have 2 projects in my Solution. One in .net 4 and one in .net 4.5 with the following package.configs

.Net 4 Project:

```
<?xml version="1.0" encoding="utf-8"?>
<packages>
<package id="EntityFramework" version="5.0.0" targetFramework="net40" />
<package id="Newtonsoft.Json" version="5.0.4" targetFramework="net40" />
</packages>
```

.Net 4.5 Project:

```
<?xml version="1.0" encoding="utf-8"?>
<packages>
<package id="CsvHelper" version="1.17.0" targetFramework="net45" />
<package id="FluentAssertions" version="2.0.1" targetFramework="net45" />
<package id="Jurassic" version="2.1.1" targetFramework="net45" />
<package id="Newtonsoft.Json" version="5.0.4" targetFramework="net45" />
</packages>
```

When i check in "Manage nuget packages" for the single projects nothing appears in "Updates".

When i check for the solution then Json.Net 5.0.4 stable appears as available update.

When i click "update" button the usual box appears but all check boxes are greyed out.

Expected behavior should be: Nothing should appear in update section for Solution because the latest version is already installed.

I am using Nuget Package restore.