I have your second problem, too! I'm working on a playable case inspired by Turnabout Samurai's ladder/stepladder scene, and when I present the right evidence to Maya, she acts like I presented the wrong evidence! How is this fixed?
Save your case in your files and then load it
Then you'll write the code for the evidence again and connect it. It worked for me but I dunno if it'll work for y'all.