无法在解决方案中调试项目

I have an issue with debugging library projects in a VS.NET 2013 VSTO solution. Both used to work and for some reason when I run the project in a debug session the Modules window shows that the problematic (non-debuggable) assemblies are being loaded from a different path (D:\Work\Path\To\Source\Repo). I have an issue with debugging library projects