Before You Start Printing
Make sure you have enabled your browser to print background color and images, otherwise clefs will not be printed.
How to do this:
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For Microsoft Internet Explorer Users:
Open Tools > Internet Options and select the Advanced tab from the window (the last one). Then scroll down to Printing and check the Print background colors and images checkbox.
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For Mozilla Firefox Users:
Open File > Page Setup, then check the Print background (colors & images) checkbox.