The links below list current limitations for OneDrive for Business. To have the best sync experience, make sure you are running the latest client. Directions on installing the latest client are here. If your workstation is not in the Iowa Domain, you may download the client from Microsoft. The latest client works for both consumer version of OneDrive and OneDrive for Business.
Sharepoint Online Limits (Note: OneDrive for Business is built on Sharepoint)
Invalid File Names (Note: the # and % are being removed as invalid file types soon)
Types of Files that cannot be added