I'm on a Mac OS X 10.7.5. Tried the Trial version of Acrobat XI Pro and had no problems combining PDF files. I purchased the software at the end of the trial period and suddenly lost the ability to combine files. When I click the link to combine files the "Combine Files Dialog Box" does not open as it did during the trial period. Instead, I can detect a small vertical line appear in the center of my screen shrouded in a mysterious grayish cloud like some artifact in lieu of a dialogue box. I contacted Adobe Chat for support and was first instructed to download the latest update. Then, I was directed to install an Adobe Cleaning program and hit the tab for Clean "All". When this did not resolve the issue I was then instructed to uninstall Adobe Acrobat xi and reinstall. The problem, however, persists. Any suggestions on how to resolve this?
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