Welcome back! The behavior you're experiencing is anomalous, so all we need is enough data to figure out the anomaly (including operating system, whether you've updated Windows recently, whether you're running 64- or 32-bit, your graphics card, etc.). Horsepower alone is not enough; the horses have to pull the cart in the same direction.
Also remember there have been many differences in the world of computers since X2...like VST3 support, which affects plug-in handling.
Don't be
too hard on support. I don't think Cakewalk realized how many new SONAR users would come on board with the lifetime updates. They're frantically trying to hire, but it's hard to find good support people, and training them takes time. Fortunately, this forum really does excel in terms of peer-to-peer support and helping others solve problems. There have been countless instances of people who were ready to throw their computer out the window, and SONAR with it, only to find out that fixing some little issue solved everything.