[Sue b. Gahn]

Frank – it worked with the below added info/tweaks:

Here is the work around, found in Apple Discussions after much furtive Googling.

Close the project that is corrupted and make sure it is highlighted in the Project Library.
** MUST USE ARROW KEYS ON KEYBOARD TO NAVIGATE TO PROJECT TO HIGHLIGHT, OTHERWISE PROJECT WILL CONTINUE TO CRASH – ONCE PROJECT IS HIGHLIGHTED — SLOWLY …
Go to File/Export XML and save that file (I saved mine to a different drive).
Re-import that file, generating a new project.
Close and Restart the FCPX App.
STAY AWAY FROM THE PROJECT FILE WITH THE CORRUPTED TIMELINE. – MY SUGGESTION WOULD BE TO MOVE TO A SEPARATE FOLDER ON ANOTHER HARD DRIVE, THUS IT DOES NOT APPEAR IN FCP X

NB: THE OTHER ISSUE WAS I HAD OVER-EXHAUSTED VIDEO IN VIDEO AND FLY-INS WHICH WAS THE ISSUE FOR THE CORRUPTION – ONCE I OPENED THE PROJECT, I IMMEDIATELY DELETED THESE CLIPS & TRANSITIONS, ETC SO AS NOT TO RENDER AND CRASH AGAIN

Open the newly project created via the XML import.
Everything should be there and working fine.