I've posted two rather long replies since the switch to XenForo, and in both cases I've noticed that when I switch to the full editor from the quick reply box (to be able to preview the post), the font for the body text will randomly change in the middle, and multiple times at time, despite all being the same in the quick reply text box.

Sadly I fixed them in those posts already, but I'm going to see if I can't reproduce it in this thread.

E: Well, that test failed, but I'm not sure if it's because of auto-merge or some other reason.