I would suggest you upload all file files except your config files from 5.13
I just tried on my install and it works fine
There were 1 files which exceeded limits which do not appear in this list:
KIMBERLYrz.jpg (exceeds filesize limit).
Either remove files to make more room or reduce the size of the files you are uploading and then try again.
I hit submit and the exceeded file is deleted and the other file is processed. I would think you have a mix of files on your server