When replying to ticket, quoted text has newlines removed (it's all a single paragraph)

Using RT-4.2.4

A new ticket is created. Some replies are added to it by various people.
I am trying to reply to the latest correspondence added. I hit the Reply
link and the rich text editor opens up, with the previous reply quoted

The thing is, the previous reply has several paragraphs in original,
whereas when it’s quoted in the editor, it’s all jumbled into a huge
single paragraph. It’s like the editor strips away all the newlines from

This did not happen in 4.0.5

What can I do to fix it?

Florin Andrei