HomeDrive is not able to synchronize multiple files that have the same name but differ only in case.
HomeDrive for Mac OS X creates a Vault based on a case sensitive Filesystem that allows creation of duplicate files with a difference in case.
Example: A file called "My report.doc�" exists on your HomeDrive Vault. You open the file for editing and save it as "my report.doc"�. HomeDrive detects this file and will alert you that this file cannot be synchronized.
Solution: Rename or remove the duplicate File from your Vault.