Can't add games to my library anymore

You need browse the game without being in analysis mode. If your game link looks like this:
https꞉//www܂chess܂com/analysis/game/computer/123456 
Change it to this: (basically, remove the /analysis/ part from the link)
https꞉//www܂chess܂com/game/computer/123456 
This is still a UI bug though and should be fixed. Those options should be present even in analysis or game review, or at least offer a way to go back to the main game screen.
(Unrelated bug, but I keep disabling the links because I'm using it as an example, not to actively link to a real game, but the forums keep re-formatting it as a link unless I use unicode or other characters it doesn't recognize as a valid url.)