I sent someone an .ai file for them to edit. She said that when she scrolls over something with her mouse, each item is specifically highlighted, but when she clicks on it to edit it, everything is selected. The answer is probably very easy. Can anyone help me?
It seems like the objects are grouped together or, more likely, enclosed in a clipping mask. Illustrator tends to do that when opening files saved from earlier versions (for ex. version CS6 opening a file saved from CC 2015 as a backward-compatible file).
To edit the objects separately, one has to 1) ungroup the objects or 2) double click the group to enter in isolation mode.