I have a similar issue. SpeedGrade CC 2014.2 will not launch and crashes upon launch attempts with Boris FX BCC9 plug-ins installed. These are located in the MediaCore folder. If those plug-ins are removed from the folder, SpeedGrade launches. When they are back in the folder, SpeedGrade crashes. This started after the latest update (SpeedGrade 8.2). I can upload a crash log if needed.
2009 Mac Pro 2x2.26 Quad Xeon (8-core)
OSX 10.9.5
NVIDIA Quadro 4000 graphics card
28GB RAM
- Oliver