You should be able to manually pull the blueprint from your project by going to \Unreal Projects\PROJECTNAME\content\ and find the individual blueprint .uasset. Once you have done this you can pull the file or you can go into your backup file \Unreal Projects\PROJECTNAME\saved\backup\ and find a previous copy of the .uasset before it broke to replace it. For the crash, however, please post this to the answerhub at http://answers.unrealengine.com in the bug reports section so we can assist you in depth. In the answerhub post, make sure to include your crash logs, dxdiag, and reproduction steps for us to be able to reproduce the error.
For your crashlogs, go to \Unreal Projects\PROJECTNAME\saved\log\ and pull the log from the most recent crash.
To get your dxdiag (Windows):
Go to your windows start menu and enter cmd in the searchbar. Open the command prompt window that appears, type dxdiag and press enter. You can save this information as a .txt document.
Sorry for the delay, I have been out sick for several days. What steps are you taking when you attempt to verify the engine? Additionally, can you link the answerhub post here so we can keep everything concise? Thank you!