Ah ok - thanks.
It is a little weird how 3.0.0.4.374.4422 worked fine with IPv6 and a static address, yet 3.0.0.4.374.4561 did not.
Are you manually entering it, or are you obtaining it automatically from your ISP? I saw only one change in the 4561 code that was related to IPv6, which was when you had it set to "Manual".