semantic-ia-fast-jump 'switches' from gcc headers to local headers

Hi,

I'm sure that the subject line of my post does not properly describe my 
actual problem, which is which related to looking up info from globally 
installed headers.

I have some code set up in a cedet automake project which uses STL vectors.

Now, for 'some time' after a fresh start of emacs/ecb/project/etc., I 
can use semantic-ia-fast-jump (C-c j) on, say, the tag 'vector' in a 
code line of the project like this

vector<double> v;

Here C-c j will transfer me to /usr/include/c++/4.8/bits/stl_vector.h.

This is kind-of what I expect.

However, after working on the project for some time, opening files, 
compiling things, etc., suddenly and out of the blue,
using semantic-ia-fast-jump (C-c j) on the tag 'vector' for yet another 
time, will not jump me into /usr/include/c++/4.8/bits/stl_vector.h 
anymore, instead it will take me into the local include files of my 
project, which (obviously) contain a line

#include <vector>

It is to that point where C-c j will jump.
Hereafter it seems as if semantic has forgotten about 
/usr/include/c++/4.8/bits/stl_vector.h and any further C-c j will only 
jump into my local include files.

Does anyone know what is going on here and how I can fix this?

Thx.
Xaver

------------------------------------------------------------------------------