I began having issues with files saved to my Dropbox account. My virus detection software said certain Dropbox cache files were being quarantined. That's good news since the actual files were not harmed, but I couldn't find the cache files so I could delete them. I was concerned, so while at the Apple store and speaking with a genius at the bar I asked him about my problem. He told me he loved Dropbox and the service was great for him. Ok, that made me feel better, I love the service too! So we took a few screen captures and sent them off to Dropbox support. In short time, Dropbox support sent me the info below as a way to clear the cache so the annoying pop ups that tell me something is quarantined will go away. If you are having a similar issue, this fix could work for you as well.
Clear your cache on a Mac
1. Open the Finder and select Go to folder... from the Go menu (or press Shift-Command-G) 2. A dialog box should appear. Now copy and paste the following line into the box and press the return key:
This will take you directly to the Dropbox cache folder
3. The Go to folder... dialog in the Mac OS X Finder 4. Delete the files in your cache by dragging them out of the Dropbox cache folder and into your Trash
Read the original article here >> https://www.dropbox.com/help/328/en