We’re working to fix an issue with some new uploads not appearing on the channel page or subs feed. We’ve also seen reports of title/description not updating for new videos–still investigating full impact and will share updates on this Community thread → https://goo.gl/zyvCgC
Generally, you'd be able to change your channel name after 90 days from the last time you've made the changes and clearing your browser's cache and cookies often fixes most issues. Here's our Help Canter article for more info: https://goo.gl/dsDQj5 . Hope this helps.