Ive just seen on another thread that they are working on it. https://forums.qrz.com/index.php?threads/error-uploading-file-adi.667842/page-2#post-5148027
I have same problem just trying to upload to QRZ! Tried it again this morning and same thing. I think QRZ has a problem on their end.
Yep, same problem here - can't upload to LOTW and the "Export" just downloads a Zero length file. TQSL Output: 12:36:08: Error: System error: No space left on device