File Upload Failure

I am trying to upload files to several different servers and I keep getting 550 error messages and the transfers do not complete properly. The server receives a copy of the filename but no actual data is transferred and the files are all 0kb in size.

I tried uploading to a few different servers, some Linux based, some widows based, I get the same result no matter which I use. I was able to transfer to all of these servers yesterday without any issues and I was using the same PC and same instance of SmartFTP.

Here is a portion of the error log from SmartFTP.

[09:58:29] SIZE unzip.php
[09:58:29] 550 unzip.php: The system cannot find the file specified.
[09:58:29] File exist check failed. File not found or permission denied.

This happened once before and then I upgraded to the newest version of SmartFTP and that fixed the problem. Now it's happening again and theres no new version to upgrade too, and also I don't want to have to reinstall the program every few days when this issue pops up.

Please check the transfer queue (the window at the bottom) for the status of your transfer. Double click the file in the transfer queue that fails to transfer. The log window opens. Then copy&post the log here.

Please check the transfer queue (the window at the bottom) for the status of your transfer. Double click the file in the transfer queue that fails to transfer. The log window opens. Then copy&post the log here.

Here's the info from the transfer queue.
[codebox][12:15:54] Resolving host name "ftp.yoursite.com"
[12:15:54] Connecting to 64.49.219.228 Port: 21
[12:15:54] Connected to ftp.yoursite.com.
[12:15:54] 220 ProFTPD 1.3.1 Server (ftp-n03.wc1.sat1.stabletransit.com) [::ffff:172.16.10.103]
[12:15:54] USER username
[12:15:54] 331 Password required for msautobody
[12:15:54] PASS (hidden)
[12:15:55] 230 User msautobody logged in
[12:15:55] SYST
[12:15:55] 215 UNIX Type: L8
[12:15:55] Detected Server Type: UNIX
[12:15:55] RTT: 67.098 ms
[12:15:55] FEAT
[12:15:55] 211-Features:
[12:15:55] MDTM
[12:15:55] REST STREAM
[12:15:55] SIZE
[12:15:55] 211 End
[12:15:55] PWD
[12:15:55] 257 "/" is the current directory
[12:15:55] CWD /www.yoursite.com/web/content
[12:15:55] 250 CWD command successful
[12:15:55] PWD
[12:15:55] 257 "/www.yoursite.com/web/content" is the current directory
[12:15:55] Remote file exist check: "unzip_.php".
[12:15:55] TYPE I
[12:15:55] 200 Type set to I
[12:15:55] SIZE unzip_.php
[12:15:55] 550 unzip_.php: No such file or directory
[12:15:55] File exist check failed. File not found or permission denied.
[12:15:55] PASV
[12:15:56] 227 Entered Passive Mode (64,49,219,228,191,249)
[12:15:56] Opening data connection to 64.49.219.228 Port: 49145
[12:15:56] STOR unzip_.php[/codebox]

Please install the latest version from here:
https://www.smartftp.com/download

Then post the complete log from the transfer queue item (with the timeout message etc).

Regards,
Mat