Minor issue.
When making a new thread or a post in an existing thread in the forums, if your post is long enough or an image is large enough to have the input add a scroll bar, and are scrolled to a point where a text or an image is located in the margin at the top of the input that is normally blank, you can still see the text or image visible behind the input for source code.
I imagine this is supposed to be hidden.
When opening source code view with the input box normally, without a scroll bar or at the very top of the post that does:
And when opening source code view while there is an image or text in that top margin of the rich text editor input box behind the source view, the series of dots you see in the upper left of the post input box is actually the text from the rich text editor underneath the source view element:
It's much more noticeable with images. Here I used a large white image, and you can see a long slice of that image between the source view and threat title section:
This is happening in Firefox, latest version, no addons, clear cache, etc. I've tested it in Chrome and the issue does not seem to be happening there.