I have a weird issue with VS 2010 pro sp1, none of my custom classes (all in the same namespace) are coming up in intellisense. I get the red swiggley lines under all my variable declarations and if I hover my mouse over them I get - The type or namespace name 'xxx' could not be found (are you missing a using directive or an assembly reference?). 

The strange part is that I have the correct using statement in place, everything is correct the project will even compile and run properly it's just annoying to not have intellisense with my custom classes while I'm developing these pages. Something to note, it's a website project not a website application project. I've reinstalled visual studio several times, I was able to fix the problem once before by recreating a new solution file but the issue showed up shortly after that again and I don't want to have to do that all the time. Any thoughts?