@MasterPie:

, MasterPie wrote

*snip*

That's because both solutions point to a /Packages directory for NuGet, which is in this case, the same directory.

Yup - that's right. Would prefer if it had been designed to name the folder '<solutionname>_packages' or something else unique to each solution - that way changes from one solution would never overwrite another.
Not a huge problem in the grand scheme of things, more a niggle.