I SOLVED THIS PROBLEM! My highlights in yellow and light green would not show up on my computer at work, but did in Photoshop (on the same document), and did on Acrobat on my laptop. Solution: go to Edit / Preferences/ Accessibility, and UNCHECK "Replace document colors" Presto. Apparently with this checked, it was treating all light colors as white or no color. I tried to find the answer to this frustrating problem (I ended up highlighting in yuk orange) for a couple of years, and then yesterday got a document with a graphic on the front that showed green on my home computer and white on my work computer. Light went on -- Googled "Acrobat not showing light colors" and this fix was offered. Hope this helps!
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