Chromatic was very big with both Perl 6 and Parrot development a long time ago. My understanding of it, having followed both projects for close to a decade, is that it came down to what was the "right" choice for one project was not the "right" choice for the other, and the schism this caused as it happened a few times left some people soured. I think both sides had cause for their actions and have cause for their feelings, but I don't really think either party did anything wrong. Such is life, shit happens, it's not fair.
Chromatic may disagree more or less on some points above, but as someone who followed along from the outside, reading blog posts and IRC chats of both parties over years, that's how I interpreted it.
