I am currently working on the SAE (7.3) course (SAE Solution build) and suddenly my custom views stopped displaying. Even doing a preview on the section rule shows nothing. I have done the SAE Solution build exercise in a way that takes advantage of the rulesets, even reverting back to earlier versions of the locked rulesets still show the same problem. I'm not exactly sure what I did to get to this issue and reverting seems to not help, I've attached a screenshot of the issue, please let me know if any additional screenshots are needed.
Whatever we do on the front end, pega systems tries to build the DOM - Document Object Model at the run time. It is totally depends upon the actions taken by us and it is totally dynamic. At run time there might be some issues/errors because of which the DOM haven't got created properly. Or may be some flag value got set wrongly which responsible for the visibility of the contents.It could be because of some network issues because of which the whole content haven't go loaded into the browser.
When you restarted your browser, it tried to build the DOM from start. As there were no genuine issues/errors, it got loaded properly.