The cause is the same as before, a dispute between management and coders over management's desire to monetize the code.
They write, "As of October 27th 2008, 'TWiki' is no longer the same - it is now commercial open source. The people that have driven TWiki development for the past decade feel the time has come to do so under a different name."
Big Money Matt Asay is all over it, calling Twiki.Net "radioactive" to VCs, who measure open source investments in large part through the vibrancy of their communities.
It could be that, through its alliance with Sun, Thoeny has an exit strategy for Twiki.Net. VCs aren't the only potential open source investors, and in this market you certainly can't depend on their being there.
We have written often here at both C|Net and ZDNet about the failing economy and the opportunity that may hold for cash-rich proprietary software companies and open source projects which exist on less-tangible foundations.
Might this be the way the former takes over the latter, simply by picking up forks?