Time Machine using OSX Mavericks

Well I guess I spoke too soon.
After upgrading my NV+ (v1) firmware to 4.1.13 RC1, I was able to connect from my Mavericks machine and start the Time Machine backup. However I haven't been able to get the backup to complete yet. It will say "Backing up X of X GB" for a while, then switch to "Waiting to Complete First Backup", and this message remains permanently. The machine will periodically try to complete a backup, but a "backup failed' message will pop up in the notifications area.

I used the Dashboard widget "Time Machine Buddy" to get this log:

Property list invalid for format: 200 (property lists cannot contain NULL)
Property list invalid for format: 200 (property lists cannot contain NULL)
Property list invalid for format: 200 (property lists cannot contain NULL)
Property list invalid for format: 200 (property lists cannot contain NULL)
Property list invalid for format: 200 (property lists cannot contain NULL)
Property list invalid for format: 200 (property lists cannot contain NULL)
Property list invalid for format: 200 (property lists cannot contain NULL)
Starting manual backup
Attempting to mount network destination URL: afp://ReadyNAS@boxy._afpovertcp._tcp.local/ReadyNAS
Mounted network destination at mount point: /Volumes/ReadyNAS using URL: afp://ReadyNAS@boxy._afpovertcp._tcp.local/ReadyNAS
Creating disk image /Volumes/ReadyNAS/CTD-MBP.sparsebundle
Failed to hide extension on /Volumes/ReadyNAS/CTD-MBP.sparsebundle, error: Error Domain=NSCocoaErrorDomain Code=4 "The file “CTD-MBP.sparsebundle” doesn’t exist." UserInfo=0x7fac69e0b610 {NSURL=file:///Volumes/ReadyNAS/CTD-MBP.sparsebundle/, NSFilePath=/Volumes/ReadyNAS/CTD-MBP.sparsebundle, NSUnderlyingError=0x7fac69e0c230 "The operation couldn’t be completed. No such file or directory"}.
Disk image /Volumes/ReadyNAS/CTD-MBP.sparsebundle mounted at: /Volumes/Time Machine Backups
Backing up to /dev/disk2s2: /Volumes/Time Machine Backups/Backups.backupdb
Ownership is disabled on the backup destination volume.  Enabling.
Forcing deep traversal on source: "Macintosh HD" (device: /dev/disk0s2 mount: '/' fsUUID: 56AAB96C-1D3D-341E-8EB8-D9FA032D35B4 eventDBUUID: 7CAC1349-6F85-46EC-9A3A-643DBD1824FE)
Total content size: 169.46 GB excluded items size: 107.96 GB for volume Macintosh HD
Found 748090 files (61.49 GB) needing backup
73.79 GB required (including padding), 114.85 GB available
Waiting for index to be ready (100)
Copied 65952 items (4 GB) from volume Macintosh HD. Linked 0.
Error writing to backup log.  NSFileHandleOperationException:*** -[NSConcreteFileHandle writeData:]: Not a directory
Error writing to backup log.  NSFileHandleOperationException:*** -[NSConcreteFileHandle writeData:]: Input/output error
Backup canceled.
[SnapshotUtilities mountPointForVolumeRef] FSGetVolumeInfo returned: -35
Failed to eject volume (null) (FSVolumeRefNum: -108; status: -35; dissenting pid: -1)
Failed to eject Time Machine disk image: /Volumes/ReadyNAS/CTD-MBP.sparsebundle

Is anyone else seeing this behavior? Thanks!