Relatively new user of the software, so bear with me.

I set everything up about a month ago with no problems. Did an intial LOTW up and download which worked fine. Today, I'm attempting my second LOTW up and download. The download worked fine. When I select QSOs for upload, then click the upload button, I immediately get LOTW END in the pop-up window. What am I missing or doing wrong?
Tnx,
Barry W2UP