New Post: Adding keywords to stream

Yes, I understand that the API works in AND mode. This is not my question. If I create a new stream and

filteredStream.AddTrack("lady gaga");
filteredStream.StartStreamMatchingAllConditions();

It works as expected and tweets start coming in quite quickly since "lady gaga" is a high volume keyword. However, if I I want to stop, add a new keyword and then restart the stream the added keyword does not seem to take effect:

//Add a keyword that won't match anything
filteredStream.AddTrack("gdfkjghsfgdsfg");
filteredStream.StartStreamMatchingAllConditions();

//Then, from a timer event handler,
filteredStream.StopStream();
filteredStream.AddTrack("lady gaga");
filteredStream.StartStreamMatchingAllConditions();

After I restart the stream I will still not get any results.