Well I replied to your post
here asking for some info mainly if people are seeing it happen with new posts or only when updating older posts.
When we did the maintenance last Thursday one of the things that was updated was the text editor, I'm trying to narrow down if this issue is only effecting when editing older posts or if new one's are having it happen too. I don't want to say "You'll have to redo it" if it's happening to new posts as well, until I can track down the problem, as that would just be more frustration. If it's only older posts then the only option would be to redo it, as there was a formatting change that happened with the update, and editing is breaking things.
I don't want to leave anyone hanging, but with there being a difference in permissions between Registered Members, Subscribers, and then all the various flavors of Staff, I kinda need to narrow it down to who and when before saying something that aggravates people more than necessary.