Error Code 83 during FTP Transfer

I configured CB to back up to FTP and I’m testing a small backup of less than 10MB.

Here is the log:
28.01.2014 17:42:22 Running custom profile Testing123
28.01.2014 17:42:22 Creating New Backup…
28.01.2014 17:42:22 Deduplication is disabled because selected destination doesn’t allow random reads
28.01.2014 17:42:22 Searching specified backup base
28.01.2014 17:44:09 Base backup found in initial location ftp://55.55.55.55:21/MyBackup_2014_01_25.cbu.
28.01.2014 17:44:09 Opening backup file ftp://55.55.55.55:21/MyBackup_2014_01_25.cbu.
28.01.2014 17:44:12 Determining base cbu information…
28.01.2014 17:44:15 Base was created Sat 25.Jan.2014 23:17:44
28.01.2014 17:44:15 Creating incremental backup “ftp://55.55.55.55:21/MyBackup_2014_01_25.cbu.” (incremental depth 1)
28.01.2014 17:44:16 Collecting information…
28.01.2014 17:44:16 This might take a few minutes depending of the number of files and folders…
28.01.2014 17:44:16 Total items found is 53. Total size is 11.6 MB
28.01.2014 17:44:16 Writing initial items information…
28.01.2014 17:44:16 Reading parent backup tree…
28.01.2014 17:44:16 Comparing incremental information…
28.01.2014 17:44:16 Reading parent backup tree properties…
28.01.2014 17:44:16 This might take a few minutes depending on parent backup size…
28.01.2014 17:44:16 Writing items content…
28.01.2014 17:44:16 Processing new item C:\Users\user1\Desktop
28.01.2014 17:44:16 Processing new item C:\Users\user1\Desktop\file1.pdf
28.01.2014 17:44:16 Processing new item C:\Users\user1\Desktop\file2.txt
28.01.2014 17:44:16 Processing new item C:\Users\user1\Desktop\file3.pdf
28.01.2014 17:44:17 Processing new item C:\Users\user1\Desktop\file8.lnk
28.01.2014 17:44:17 Processing new item C:\Users\user1\Desktop\folder1
28.01.2014 17:44:17 Processing new item C:\Users\user1\Desktop\folder1\file01.pdf
28.01.2014 17:44:47 Reconnecting to “55.55.55.55:21”…
28.01.2014 17:45:21 Reconnected successfully. Resuming with backup file (null)
28.01.2014 17:45:21 Processing new item C:\Users\user1\Desktop\folder1\file03.pdf
28.01.2014 17:45:21 Processing new item C:\Users\user1\Desktop\folder1\file04.pdf
28.01.2014 17:45:21 Processing new item C:\Users\user1\Desktop\folder1\file05.pdf
28.01.2014 17:45:21 An error occurred while writing data to backup!
28.01.2014 17:45:23 Error Occurred
28.01.2014 17:45:24 Backup failed with code 83 (Invalid file handle).

CB Version 4.3.3.19
Windows 8 x64

I am having the same issue. Any ideas?