I'm sure you're as disappointed as I am, but in truth I have the greatest faith in the people who run LJ and I'm sure that if they have done this on purpose it will be for a good reason.
I'll investigate further, but for the moment TrustFlow is out of action. Sorry!
Update: I just got a very positive email from Brad. They did block it, but they're interested in working out how TF and LiveJournal can be fixed so TF's impact on LJ is greatly reduced. Once again, Brad rocks!
The latest news about how work is going will be posted to the trustmetrics community.