Hmm! Thanks for letting me know.
It appears that about 100 save files from C-IV GOTM 16 have gone astray during the server change-over. As far as I can tell that is the only game that was affected. If GOTM 16 players still have their submitted saves and want them to be restored to the archive, please email them to me at alanh <at> gotm.civfanatics.net and I'll upload them to the server.
Apologies for this failure of the transfer process.