i looked at my install, and i am not having this same issue, i can create an html block no problem, where i am facing a problem is when i try to create a new page? sounds to me that there is something with a bad file permission that is not letting you write to a file if its not saving the work you are doing. that would just be my best guess of course. this release is so new and there is so much on here that was not on any of the beta releases.