do you need save file backups ?
first off open Upllat \ settings shut off the setting in Uplay that enables cloud saves (uncheck the option )
as it sounds like you may have a corrupt save
grab my . zip file and it has a save for just about every mission of the game and instructions on how to use them
remember never trust an Auto save ... always before you quit the game go back to a safe house and save and quit .. you can not save MID mission FAR CRY 3 worked the same way
you can get my save back up here http://www.filedropper.com/farcry4saves
you should always manually back up your Uplay save files .. instructions and a link are provided in the read me file of my .zip archive .. its been scanned and is virus free
also always launch Uplay and Steam or Origin your game is from.... as RUN as ADMIN
good luck ....but that should sort ya out
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