If you’re having trouble syncing items in your Dropbox with computers on different operating systems, you’ll be happy to know that the fine folks at that company have provided a way to weed out files that may be causing problems. Visit their file check page, log in to your account, and you’ll get a list of any possible sync conflicts.
Dropbox can help sort out file sync issues
Some issues that may cause problems include incompatible characters in filenames, capitalization conflicts, and resource forks. For more information, visit the Dropbox help page on syncing conflicts.