708 Closed Captioning
Just like open captions have been buggy, so have closed captions in the past release of CC. I shouldn't have to re-import a .mxf into my timeline to see why only two of three captions that I embedded and exported are showing up and only one is actually playing back.
To add, it would be wonderful if something other than a .mxf could be used as something we could embed 708 captions to (i.e. .mpeg2, .h264 - something).
We have completely redesigned the captioning workflow in Premiere Pro version 15.0. You will see many dramatic workflow improvements. Please update to the latest version. Please let us know if you are still running into issues.
Learn all about the new captions workflow here: https://helpx.adobe.com/premiere-pro/user-guide.html/premiere-pro/using/working-with-captions.ug.html