unqued buffers

Hi !

I add buffers to a source using the que commands. Sometimes i get invalid 
operation on freeing buffers received from the unque command ? In the below 
code snippet you will see the abstaction layer i have above openal but just 
replace the gzAudio with al.

This only happends on OpenAL 1.1 Mac OSX 10.4 and not on windows

gzVoid gzAudioSource::cleanBuffers()
{
        if(gzAudioEngine::hasValidEngine() && m_sourceID)
        {
                gzInt bufferCount;

                
gzAudioGetSourcei(m_sourceID,GZ_AUDIO_BUFFERS_PROCESSED,&bufferCount);

                gzArray<gzUInt> buffers(bufferCount);

                
gzAudioSourceUnqueueBuffers(m_sourceID,bufferCount,buffers.getAddress());

                gzAudioDeleteBuffers(bufferCount,buffers.getAddress());
        }
}