This error is thrown when MODE Z is enabled (
TransferMode property is set to
FtpTransferMode.Zlib) and the received data does not end with a block that indicates end of compressed stream. It's possible FileZilla doesn't check for this.
We will send you a link to a version of Rebex FTP that doesn't perform this check in an hour or two. Please give it a try, check whether the file has been fully transferred and let us know.
* UPDATE: *
The fix is part of build 4060 http://blog.rebex.net/news/archive/2011/02/15/build-4060.aspx released in February 2011.