Hi – I noticed that when I was searching the forums here, and wasn’t sure it applied to this version.
I’ve tried testing various simple posts, and it really does only seem to affect me when I start a new paragraph – when I post one paragraph, it’s not rejected, but try to post that paragraph twice in the same post, and it all goes horribly wrong, regardless of the content.
Looking at the html view of the post doesn’t show anything untoward – is the
<br />
combination affecting wordpress in the same way?