C++ – Eclipse method could not be resolved for vector of vectors

Whenever I try to access a method or field of a vector element via a index operator, e.g. bar[0].push_back(0) on vector< vector< int > > i get a "Method could not be resolved" Semantic Error from eclipse.

The code compiles just fine with g++ -Wall or clang++ – here is a short example.

#include <set>
#include <vector>
#include <iostream>

int main()
{
    std::vector< std::vector < int > > bar(10);
    bar[0].push_back(0);    // eclipse "method 'push_back' could not be resolved
    (bar[0]).push_back(1);  // eclipse "method 'push_back' could not be resolved
    bar[0][0] = 0;      // This and all else is just fine for eclipse
    std::vector<int> &bar0 = bar[0];
    bar0.push_back(2);
    std::vector<int> *pbar0 = &bar[0];
    pbar0->push_back(3);
    return 0;
}

I have a simmilar issue with std::vector<std::pair<int, int> >::iterator trying to access iter->first. (Field 'first could not be resolved).

It is a C/C++ project, .cpp file, in Eclipse 4.2.1, there are no unresolved inclusions.

I am completely lost here – how can I get rid of this eclipse error?

Update: I have also tried this with the latest available Version: Juno Service Release 1. Same result.

Update2: I actually noticed that with a brand new project, the error does not occur, so I should be able to eventually determine what setting is responsible for this error. So far I could not identify anything, no (non inbuilt) symbols are defined and the paths look good as well.