ICEPush does not work in Opera 11

ICEPush is a great addon, but it seems that it does not work in my Opera browser (Opera/9.80 (Windows NT 5.1; U; cs) Presto/2.8.131 Version/11.10).

I have tried to run it in my workspace and it seems that the push request is successfully served in the server, but Opera does not receive the response.
Please, do you know where could be the problem?
Thank you in advance