Version:           3.1.1 (using KDE KDE 3.3.1)
Installed from:    Unspecified Linux

Fedora Core 3.

C++ project, active Language is C++.

Opening a file that contains (or switching to a tab):

....

XERCES_CPP_NAMESPACE_USE

class SAX2PrintHandlers : public DefaultHandler, private XMLFormatTarget

....

Where XERCES_CPP_NAMESPACE_USE is defined in Xerces-c headers:
#define XERCES_CPP_NAMESPACE_USE using namespace XERCES_CPP_NAMESPACE;

The line in the program that start with "class" is marked as wrong because of the missing ;
at the end of the previous line.

So far the problem is similar to http://bugs.kde.org/show_bug.cgi?id=34438

If the active language is changed to C the line is no longer marked as wrong.
If I switch back to C++ it is marked again... going once more to C leave the line marked, after
this no matters how many time the active language is changed the problem persists.

If the starting Active language is C the error is raised, and disappear switching to C++, 
switching back to C has the same result to definitively raise the error.

If I change tab and go back to the previous one I can change once (only once) the active language to 
remove the problem.

If before the use of XERCES_CPP_NAMESPACE_USE I write something like:
#ifndef XERCES_CPP_NAMESPACE_USE
#define XERCES_CPP_NAMESPACE_USE
#endif

The "class" line is given as correct, if I put those lines in a local header I have the same problems.

I tried to configure the macro in the C++ Parser but the problem persists.