I noticed in the new update that the "mark as read" bar that pops down is even smaller. It's now harder to click, I have to be more precise.
And on that note of things being way too small to click, the scroll bars are a ridiculously puny 4 pixels wide. I'm on a laptop so I don't always have a scrolling wheel to use, and arrow keys can't be used to scroll anymore, so I have to try and grab this tiny thread of UI to actually read new messages. Half the time I give up and use my touch screen to scroll (I'm lucky I have that option.)