In Visual Studio, when using Manage NuGet Packages for Solution, the ProGet feeds never return. Visual Studio just hangs. No updates from the feed are ever delivered. When using Manage NuGet Packages at the project level, the ProGet feeds work great and are nice and quick.
Any resolution to this problem? It's the only issue preventing full usage of ProGet.
Update: I'm now happily working with the ProGet team on this issue.
ProGet v3.5.x version has resolved the issue.