Using R# 5.0.1533 for soem time now with Visual Studio 2010 (on win 7 professional) and suddenly today I find that all references to Linq are colored red and when I hover over it , it says cannot resolve symbol xxxx.
Suspending R# , all is well, resuming R# back to the red color and cannot resolve symbols.
var query = (from inv in invaders
group inv by inv.Location.X
select invgroup.OrderBy(inv => inv.Location.Y)).ToList();