"Invalid file name." message when copying directory

I’m having the same issue on the 64GB drive.  I bought the drive for the software but the fact that you can’t store directories from a Mac makes the software totally useless.  Having to delete.  

For what it is worth, the program also crashes if a subdirectory has the same name as the parent directory, leaving the whole database mangled.  Repair (properties>repair) seems to work, but I am not trusting any important data to this program so I haven’t bothered checking if repair really completely works.

I’ve reformatted the drive and I’ll just use the Mac’s builtin FileVault since the person I’m giving this to has a Mac.