"You guys release a Carrara 8.5.1.19 that wasn't even tested for 15 minutes" - that sort of comment, which is utterly untrue, makes it pretty much impossible for anyone to engage in a discussion with you. I am not part of the Carrara development or testing, so there's a limit to what i know (and an even stricter limit to what I can say). Criticism can, and should, be a matter of pointing out issues - once they are wrapped in hyperbole it comes very difficult if not impossible for anyone to respond to them.