Hello @CommonsT. I see that you did chat with our Support department about both issues that you brought up in your post but I did want to answer your questions here as well in case any of our customers had the same questions.
On the day that you posted this, some customers were experiencing an issue with the previews of their campaigns displaying differently from what was displayed in the editor. This system issue has since been resolved and we apologize for any inconvenience this may have caused you.
In regards to not being able to change your text, did you copy and paste this text into your campaign? What I recommend to copy and paste your text into a text editor such as Notepad (Windows) or TextEdit (Mac) and then bring this text into your Constant Contact campaign. This way, your text comes in without any problematic formatting attached to it. You can view this FAQ for more information.