On current projects, I'm only using the delay segment of Channel Tools, but I'm not experiencing any problems with it. I have tried inserting it with a project playing (not something I normally do) and it did not cause any issues. I also have X3 on the box with older projects created in X3. I'm not seeing any problems there.
Win 8.1, Sonar Platinum (Cambridge), VS-100.
Double Precision is off.
Glen