Closed Captions Editor not Loading

Sorry you are getting this.  I had this issue a few years back and after a lot of trial and error it was determined that my .net framework and Visual C++ runtime engine needed to be reinstalled.  This can be a common occurrence if you have applied an update recently or installed other apps that might have placed a different version on your PC.  You can try doing a repair to your Storyline installation to see if that fixes it.  Give that a try and post back and let us know how you made out.