@wsdotnet:

I noted and reported a specific scenario where Intellisense just gives up the ghost. Don't know if it might be affecting you. It seems that if the namespace arrangement of your project does not necessarily mirror the folder arrangement of the files themselves, Intellisense gets a bit wonky at least in those files that are in the folders where the namespace does not match...

Of course it compiles fine and did not have that issue in VS2010....

In my case the issue arises because initially the project was all in a flat namespace with all the files in a single place. As its grown some things were moved into folders to keep sanity. The namespace was kept flat just because of ease. Now however on those source components and classes in the affected files (an all their references and uses everywhere else) we have to make the namespace adjustments to mirror folder arrangement, to get Intellisense to work properly with these items...PITA....