We moved this to GIT as an issue for PTVS. https://github.com/Microsoft/PTVS/issues/430
Our team has been working with the PTVS for months now with no issue.(not adding in any imports for __builditin__ etc)
Today, any types that are found in __builtin__ are flagged with 'unknown type'.
The funny thing is that if you right click, in the import options, the __builtin__ comes up as an option. The environment database have been deleted and recreated; which has not helped.
I do not want to start referencing the native imports, so that the upgrade to 3.X is not as bad.
Any direction on what could have caused this would be great.