Wow, I'm really sorry. I don't know how that could happen. There is a line in the upgrade script that goes like this - if (!rename("images/" . $row['path'], $new_path)) { echo "<li>Error: could not move file!</li>"; $errors++; }
However, there is no code in there that deletes the files! The rename function should not delete the source file unless it actually moves it successfully. This is base PHP functionality. What version of PHP do you have? Are you sure they aren't somewhere on your server hiding?