Using more than one track keyword causes 401 unauthorized

[miikeat]

The client runs well with one track phrase, but as soon as I add a second one it results in a 401 unauthorized error.

[miikeat]

this discussion seems to be related: https://groups.google.com/forum/#!topic/twitter-development-talk/KVrjsp3xoWs
when i try to replace the comma in the track string with %2C, as suggested in the above discussion, the client works again!