Cannot download file "Retry at XX:XX:XX PM"

This used to happen occasionally, but now it happens on every file. When downloading, I get an error message saying "Waiting for children." for the folder, and the file itself has the status "Retry at <TIME>" but it never works. I've tried restarting, adding to the queue, nothing.

I saw a similar topic on this forum, but the thread was locked because SmartFTP deemed the person to be a pirate. I have paid for my copy and have used it for several years, even paying in advance.

Below is the log from one of the files:

[17:40:56] Getting attributes of "/home/owner/completed/architect01.zip".
[17:40:56] Attributes successfully obtained.
[17:40:56] Transfer failed.
[17:40:56] Operation End
[17:41:30] Operation Begin
[17:41:30] Resolving path "/home/owner/completed".
[17:41:31] Path successfully resolved to "/home/owner/completed".
[17:41:31] Getting attributes of "/home/owner/completed/architect01.zip".
[17:41:31] Attributes successfully obtained.
[17:41:31] Multipart Transfer. Number of Workers = 8
[17:41:31] Resolving host name "XXXXXXXXXX"
[17:41:31] Connecting to XXXXXXXXX Port: 22
[17:41:31] Client closed the connection.
[17:41:31] 0 bytes transferred. (0 bytes/s) (109 ms)
[17:41:31] Getting attributes of "/home/owner/completed/architect01.zip".
[17:41:31] Attributes successfully obtained.
[17:41:31] Transfer failed.

Post the system information from the menu: Help->About "System Information" dialog.

+- System -----------------------------
Microsoft Windows 2008 R2 Server Enterprise Edition (full installation)
Service Pack 1 (Build 7601)

CPU Speed : 2310 MHz
Total Memory : 1022 MB
Free Memory : 588 MB

+- SmartFTP ---------------------------
Version : 4.0.1180.0
Time Stamp : 2011-04-17 22:33:50
Platform : x64
Id : 400116410
Maintenance : 2013-04-12
Days in use : 38

+- Language ---------------------------
en-US

+- Internet Explorer ------------------
Version : 9.0.8112.16421