Even Though this post is old I experienced this problem 3/20/16. I feel obligated to share my experience in hopes that it may help someone else. If you are experiencing a pause in your software during exporting (in my case) I did a direct link to Speedgrade. Even though direct link its not recommended due to many many issues, it usually works. Now in my case it was keyframes in the speed grade application that halted my exports. My project kept pausing (running out of application memory) at 40% which in relativity was exacting where speed grade keyframes existed.
Solution #1 create a EDL of your project and open in Speedgrade then continue from there like normal.
Solution #2 You have already color corrected your timeline and only selected shots have keyframes in them. Export those individual shots from Premier with no LUT. Open them in a new timeline In Speedgrade, save your previous LUT from your already color graded Premier Timeline then copy and past your keyframes. Export from Speedgrade. import back into Premier timeline. Export whole timeline. Problem solved
hope this helps someone!