I don't remember this problem from the last time I upgraded: using ftp, 180 files failed to transfer. I tried again, and 273 files failed to transfer! Without them all transferring from my computer to the website, I shouldn't expect a very stable wiki, should I?
What was even more weird was that dozens of times the upload was delayed while Filezilla asked me if I wanted to overwrite a newer file with an older file. How is that possible when I am transferring the unzipped files into an empty folder?!!!