Stopping after a certain point

Hi all,

Newbie here, so apologies if this has been mentioned elsewhere - did a search, couldn't find anything.

I've been using SmartFTP for a good number of months now, and haven't had any probs. However, I'd just uploaded a file last Thursday, and then later that day went back online to upload another file, and SmartFTP couldn't get past this point:

150 Opening ASCII mode data connection for file list
16139 bytes received successfully. (15.76 KB/s) (00:00:01).
Connection closed.

What's happening? I tried changing to active mode, no joy. Could it be settings on my computer? Settings on SmartFTP? Server up the left?

Any help appreciated!

Rob.