My team has been using the Enable Package Restore option since Nuget 1.5 to keep packages out of our source control. When Nuget 1.6 was released we noticed an issue where it wasn't pulling the packages down, and tracked it down to the Nuget.exe in the .nuget folder needed to updated to 1.6 to match the Package Manager.
What's the best way to update a solution once Nuget has been udpated? I don't see an easy way from studio to tell which version of nuget is in the solution folder. So far we blow away the .nuget folder and re-run the Enable Package Restore command.