Files Missing From SanDisk Secure Access Vault

I tried to back up a folder with 212 files in it to a SanDisk flash drive using the SecureAccess encryption

software.  After I copied the folder to the flash drive, I noted that only 195 of the 212 files were copied.  I asked two

friends who also use the encryption software if they had the same issue.  Both friends discovered that the software

did not copy all the files and there was a large amount of missing data on their backups.  Is there a solution to this