I found a solution!! I was having the same troubles mentioned on here with both the Automated Questions and my Welcome Message. The Automated Questions seemed to have disappeared and yet I was still having guests tell me what time they were going to arrive (I wanted so badly to remove this question because it seems to imply to the guest that it's up to them, e.g. they were not taking my check-in time into account when responding). Also, I wanted to update my Welcome Message but when I would type in a new message and save it, the old one would just come back - I could not get rid of it or edit it. So, I just spent the last couple of hours on a casual chat with CS and they couldn't help me and would get back to me, yada, yada. I had already tried other browsers as well as turning IB off and back on again. And since there was no way to just unplug or kick the airbnb system to make it work, I tried the app. And on the app, I was able to update my Welcome Questions as well as see and update the Automated Questions! Maybe I'm the last to know but was really frustrated and hope this helps someone.
Edit: And, I just found, you can "preview" the questions and message to see what the guest is going to see! That's pretty cool, I don't remember having that before. Anyways, it's a bit of hassle but at least a workaround. I'm excited anyways 🙂
Listing --> Booking Settings --> Guest Requirements --> Guest Trip Information