The Problem
Resharper’s Intellisense, while generally awesome, does not find navigation properties in Linq statements
The Cause:
No Idea
The Solution
Switch back to Visual Studio 2012’s Intellisense, then go to Resharper > Options > Environment > General and make sure that the “Store Caches in the System Temp Folder
Close and Reopen Visual Studio 2012 and everything should be working well.