Transfer Queue stalled 0KB/s

I'm having a problem with the transfer queue. I've used SmartFTP for months without problems (although I liked the previous versions that allowed direct transfer w/o the queue. Now, I'm trying to transfer and the queue shows it's uploading, but at 0 KB/s - in other words, nothing is happening and the queue just stays that way forever. Can anyone please help? I've tried uninstalling and installing the latest version. The file name shows up under the Remote Browser, but with a file size of 0KB. Thanks.