I am demoing Acrobat 9 Pro on a Windows machine to create some sample PDF Portfolios. I am hoping to present them at a budget meeting to purchase the upgrade from 7.0 to 9.0 for our Mac systems - but I am having some strange thumbnail issues. On the Windows system I am creating the portfolio with no issues, but when viewed in Reader 9 on my Mac system the automatically generated thumbnails look inverted/reversed in colors. Is this a platform compatibility issue or a bug in the trial software perhaps? The original files are jpgs, if that info helps.