Animation ruined due to adding keyframes

I added frames at the start of the scene and saved and closed toon boom Animate pro to work later. Now when i open my file, all animation sequence is ruined. I prepared a large project and now its all gone.
Please Help.
I didnt knew about this consequence until i read about how the “add frame” feature works only on drawings. I have tried to figure out a lot but i am helpless. Please help ASAP

You should contact support to have a look.

Hace you tried looking at other frame positionms on the timeline?
Have you tried zooming-out and making a selection box to see if
anything was selected? Did you perhaps import an opaque bitmap
image that might be blocking the stuff you drew earlier?