It should work fine, but we'll do some testing here to see if we can find out what's going on there

Quick question. Could you tell me what the file size of the FTP log is?

Ok, that shouldn't be too big then. Would you be able to send us one of the log files that isn't working? If you attach it here, you can leave the "Protect these attachments" checkbox enabled, to make sure that only our staff can download the attachment.