I have two Read More types, one with a button (ID=1) the other in-line (ID=2). At the start of today none of these would work when pressed. After disabling other plugins I was able to get the in-line working but not the button one. So I have made all of my Read More types to be in-line (ID=2).
I will change back one of the sections to be a button (ID=1) so you can see the problem.