Hi! I am using Nicky Romero Kickstart plugin for sidechaining. When you have several instances of plugin installed AND use fast bounce, Foxboro update create heavily pumped sound in final render. It seems something wrong with this plugin and Foxboro. Everything was OK with previous version of Sonar. As soon as you choose regular, not fast bounce, everything works correct. No excessive pumping, everything as you hear it during mixing.
Edit:subject updated with [Solved] - scook