Just tried it and CRASH! I've also complete uninstalled everything using a third party utility that was suggested by Fran and reinstalled the whole cloud.
It's a video card issue - intel Iris.
I'm on a macbook pro with Iris video card. With graphic acceleration enabled, speedgrade crashes right out of the gate. With premiere, the secondary color corrections (showing the mask) results in a white screen only.
If I turn off graphic acceleration in premiere and speedgrade, the apps work fine (albeit slowly).
It's a videocard issue. It doesn't happen with the iMac with and an Nvidia card.