HELLP! all of my art boards are saved as one picture

[#1]

all of my artboards are saved as one picture. I cannot edit on them anymore .. I did save them as pdf and ai. but when I go back to edit/move/add anything I am not able to do so! 

[#2]

all of my artboards are saved as one picture. I cannot edit on them anymore .. I did save them as pdf and ai. but when I go back to edit/move/add anything I am not able to do so! 

[#3]

Which version, which system?

Where do you save your files?

Has there been a crash?

Exactly what file format with exactly which options do you save?

Do you open the files in the same version?