When a student sends me a “problem” Illustrator file, the first thing I do is open up the Document Info palette (Window > Document Info). Using this tremendous resource, I find out virtually everything I could possibly need to know about a document. The kind of information that can answer lots of questions, which can also help to find the cause of possible problems.
Using the Options menu of the Document Info palette, I can get a overview of the Document or take a closer look at the details. What kind of Objects are being used and how many of each? (Open Paths, Closed Paths, Masks, Compound Paths, Gradient Meshes, Etc.) Are there any Graphic Styles? How about Brushes, Spot colors, Patterns, or Gradients? What Fonts are being used (including a detailed closer look at Styles and Font Format) And what about Embedded and Linked Images? Having easy access to detailed information like this can make the whole problem-solving process a lot faster and more efficient.
Tip provided by Jeff Witchel, Certified Adobe® Training Provider.