The first issue which is a minor inconvenience is the Cinematic. I have searched and what I saw was renaming the files Interface, Cache, WTF, and Utilities. I did this renaming renaming and then logged back in waited over 30 seconds like references said. At which time I Logged out and back in and still have the Cinematic. Only difference was no add ons and had the new game install warning about photosensitivity and main cinematic. So that didn’t work.
Second issue which I find very frustrating, after reinstalling game and start playing after over year of not playing. Only 1 character can see random wild pet battles. The above reset of interface files did nothing. I have went to the Home city Stormwind and talked to pet trainer and only one had a pet I must have forgotten, but already knew the pet battle, so nothing to get in training. I know before when I did this before I had this ability on all my characters. I even as a challenge leveled a character to max just doing pet battles. So this is definitely a new issue.