I too am having this problem, as reporting in thread
https://community.quicken.com/discussion/7877594/why-are-the-daily-gain-loss-price-day-change-and-price-day-change-not-displaying However that discussion says it has been closed, and when I click on any of the links suggested in various answers, they go nowhere.
So sorry for posting a new question on this, but I can't seem to get anywhere on the prior.
I have had this problem as long as I remember, but it could in fact have started after one of the updates suggested in the other thread. I am on Windows 10, Quicken Version R34.24, Build 27.1.34.24.