If you see a red dot appear on the image of your itinerary on your trip's list like this:
It can mean one of two things:
Your client has messaged you and you haven't seen the message yet.
You can view the message by going into the itinerary builder and pressing on "Discussion" behind the Library on the right-hand side of the builder.
A collaborator has made edits that you have not viewed.
If you invited someone to collaborate on the itinerary with you, they may make changes or edits that you haven't seen yet so we will notify you that there have been changes made.