I am unsure if this is related also to the bug report I've seen about the portal sometimes not loading, but sometimes when I quit out of one save and then go into my list to load another, the saves just.. don't do anything? I have to close the game and re-open it to get them to work.
It has never happened after booting the game, only if I quit to the menu, and then go into the save list to try loading something. It's not 100% of the time, either. It's been happening since I started playing, 2-3 hotfixes ago, so easily over a week and a half.