For me on SG CC 2014 I get the opening start Icon and a running load bar that just keeps cycling. The program never loads. I was having issues with AE, PP, and just about everything else CC 2014. That problem was related to the permissions on the following directory:
[drive]/Users/[username]/Library/Preferences/Adobe/
You need to make this directory R/W for everyone. This fixed the load problems on PP, AE and Photoshop but SG is still deader than a doornail. As a note, the previous version of speedgrade is now broken too. My machine is a MBP running OSX 10.9.3.