One of the first conflicts I noticed after install Mac OSX 10.7 was the total failure of the popular cloud storage program Evernote. I got a message saying Missing Plug-In when trying to view PDFs in Evernote.
The solution, published by Evernote’s support staff, involved reseting the Java preferences or drilling down into the library to remove some Adobe PDF thing. Yeah right.
My solution, and one I recommend for you as well, is just to reinstall Evernote. It’s free, it’s in the App Store, and once you reinstall it runs just fine.
Sometimes simple answers are often the best.