This happens to me as well (though not when die), its apparently because of one of the online patches. There is a workaround though.
If you start the game offline your able to load saves/replay missions (just going offline midgame doesn't work)
EDIT: and now I'm also suffering from the internet glitch... Very annoying.
[spoiler=uniquecode]This is how you use spoilers![/spoiler]
Last edited by SpinelesS; 01-01-2014 at 07:05 AM.