Weird, I can’t reproduce it too.
Yesterday it was causing errors each time.
About 3; oh sorry, I overlooked the option. Solved!
About 1;
The former is no, and the latter is yes.
Now I find that Solo & Mute buttons also aren’t lit. I was surprised myself that I did not notice it until today 
/ . Definitely you had changed something (from a few beta phase before, I guess).
Below may be a hint.
3880 
About 4; Ahh no no. I think that my explanation does not reach you precisely. BPM value doesn’t move when I do slow tweaking, despite of the range. It’s not always happen, sometimes works. See this midi signal.
3881 