Hey,
for people who is having problems with IntelliSense, my problem might help some others.
My IntelliSense was working on x86 but not x64
I tried everything to solve it but what had really happened was that I had overwritten the file “C:\Users\username\AppData\Local\Microsoft\MSBuild\v4.0\ Microsoft.Cpp.x64.user.props”
with the content from a colleague to build other project.
I added these lines which are the ones which screwed up my x64 Intellisense…
<ItemDefinitionGroup>
<ClCompile>
<AdditionalIncludeDirectories>
<\AdditionalIncludeDirectories>
<\ClCompile>
<\ItemDefinitionGroup>
So all I had to do was to REMOVE THEM