What is the command that you used to generate the packages with the symbols? I tried to do the same exact thing nuget.exe pack -Prop Configuration=Release Framework.csproj -Symbols This creates two files: Framework.nupkg and Framework.symbols.nupkg. I put these files on a network share, used them from another project and debugging worked fine.
Have you tried putting the *.nupkg and *.symbols.nupkg files on a local disk instead of a network share?