As a workaround, you can click on the little blue"HTML" button in the tool bar.

This takes you to raw HTML markup mode where you can fix the problem by adding a bit of text outside of the quote elements (where the regular editor is not allowing you to type anything).

Then go back to the WYSIWYG mode where you can continue the new text.

Users who are told to switch to text are being badly advised.

This idiotic little dance is a unifying theme of all HTML editors pretty much, on and off the web. I've had to do this kind of thing in every web forum I've ever been in as well as in desktop HTML editors like Kompozer.

On 01.12.2013 14:40, Nick Edwards wrote:

Hi,

Often, in replying to HTML messages, it is impossible to insert an
inline reply throughout the message, if I try type anything, even
through  enters, backspaces, deletes, whatever, it ends up being
inside the last post, making it appear to have been said by the person
I reply to, this was reported by many users and I can't see a way
around it.

Shouldnt the default html editor see a local keyboard line input as a
break and insert of new content?

Users are getting sick of being told to covert message to text so they
can sanely reply.