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All of the lesson files are intended to display at High Quality Display, which shows the most amount of detail in images. When you open the lesson files saved in InDesign CS5, they may display at Typical Display, which is faster but less accurate and less attractive. Depending on the speed of the computer you’re using, you may wish to choose View > Display > High Quality Display for all documents you open.
Occasionally, when you open an InDesign CS5 document in CS5.5, an alert asks if you want to update the document to the current version. Click OK.