Matinee sequences stopped working in level BP?

Guys does anyone know a possible reason for matinee sequences to stop working after a project crash?

I’ve got a project with many matinee sequences in it for doors that open when the player gets to a trigger, these were working fine but after a crash they no longer work, now when you get to the trigger the door disappears!

Worst still when you load the matinee editor, everything crashes!

Can anyone please advise what could be going wrong and how to put it right?


Someones gotta know!?