I second the issue with weird text behavior. I’ve had similar issues but specifically with the H1-6 text blocks.
As soon as I drag one onto the page, the editor throws a fit and refuses to let me edit any text on the page. I can leave it for ages and come back but still it won’t sort itself out. The only option is to reload the page, which means that I generally loose the last few minutes of work before the problem occurred.
This has been happening for the last couple of months across multiple sites.