Spooky! Objects have moved between layers, on their own! Help Please!
I have a client who requires .ai floorplans to be laid out on specific named layers: walls, doors, furniture etc.
All of the plans were drawn in illustrator, to his standard, by my artworker, and then linked into an indesign file by my designer.
The project is now complete and the working files, assets etc. sent to my client.
It seems that at some point all of the content from 7 of the layers has moved into a single, upper layer and has been "grouped", leaving 7 empty layers.
How did this happen and how can I restore the information to the correct layers without using "undo"?