Oh yes! I may understand that YOUR problem is not Mobile Broadband.
But: you should note that I have posted to this topic before you have reported your problem here.
We may have similar symptoms
though the cause may be different. Mine are clearly related to Mobile Broadband, since dialup connection filtering works ok. Only W7 Mobile Broadband feature is problem in my case.
Please try not to be so jealous about your problem! I think devs will look for both of our problems as well. There is rooms for both here, aren't there! Even in the same topic... So - keep it calm