I get what you're saying but even though I have the "more columns in CAS" mod, I tried my new game without CAS and it still was glitchy. I have the new Sims 4 folder but I basically kept all of my save files and mods. before I put them back in the game I tested it without any of my previous stuff and it still was broken :/
Reinstalling the game will not fix the files in the old game folder because it is done in the installation folder in Program Files, and your current game is in the second folder in Documents. To repair files in this second folder you have to do a factory reset as described in this post:
http://answers.ea.com/t5/The-Sims-4/FAQ-Troubleshooting-Steps-amp-Known-Issues/m-p/3621199
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