This just started recently for me. In Chrome, when reading a post that extends beyond the bottom of the screen, scrolling down to the point where “MODX Community” is replaced by the topic’s subject line makes “MODX Community” flash continuously between two locations. It’s a strobe effect and could possibly induce seizures in some readers.
In addition, if you scroll down slowly, the post will keep repositioning with the subject line showing, so you never make it to the end of the post unless you scroll fast. My mouse wheel is set to three lines. Using the mouse wheel slowly means you never get the see the end of the post. Using the scroll bar limits the effect to a single time, but you can still see it.