Zapped PRAM ... no luck.
Here is CCC log:
12:11:41 The target volume has ownership enabled.
12:11:41 ACLs are not enabled on the source volume, not enabling them on the target volume.
12:11:41 Authenticating...
12:11:44 Initiating synchronization engine...
12:11:45 Cloning...
12:44:36 rsync: write failed on "/Volumes/OWC Neptune/Library/Application Support/IK Multimedia/SampleTank 2.x/Instruments/MP Instruments copy/Percussion/Full Percussion Maps/GM Perc Map 2.stw": Invalid argument (51)
12:44:36 rsync error: error in rsync protocol data stream (code 12) at /Volumes/Home/Users/bombich/Development/Bombich_Software/rsync/rsync-3.0.6/io.c(600) [sender=3.0.6] (51)
12:44:37 CCC Synchronization Engine: Some errors were encountered during the backup., Error code: 51
12:44:37 Sync Engine warnings: (
"rsync: write failed on \"/Volumes/OWC Neptune/Library/Application Support/IK Multimedia/SampleTank 2.x/Instruments/MP Instruments copy/Percussion/Full Percussion Maps/GM Perc Map 2.stw\": Invalid argument",
"rsync: writefd_unbuffered failed to write 4 bytes to socket [sender]: Broken pipe (32)",
"rsync: connection unexpectedly closed (5047234 bytes received so far) [sender]",
"rsync error: error in rsync protocol data stream (code 12) at /Volumes/Home/Users/bombich/Development/Bombich_Software/rsync/rsync-3.0.6/io.c(600) [sender=3.0.6]"