Hi Nikki ...
I've been dealing with this for a while (Chrome user) and here's how I got around it.
First, I will reply to the message as usual. Then, I highlight all of the message and either click "Back to Messages" or "All Messages". I'll then go to the message I started replying to and click the "Quick Reply" Icon (it's left of the delete "x" icon to the right of the message description and member name) ... move my cursor to the message text box and paste the message ... then I'll click send.
It's a work-around, but it does work. One thing I noticed on the message thread ... WGT removed the "HTML" editor ... not so on the profile page or the quick reply page. I wonder?????
My best to you!
Kat ♥