On a recent project I was working on, I came across a very interesting error. When I was in Experience Editor and trying to add some components to a brand new page, there were 2 “Add here” buttons on the top and bottom of the empty placeholder. However, the bottom one would return an error that just responded as “An Error Occurred”. I reported this error to Sitecore to see if they could help point us to a solution since this was impacting the client’s content authoring process. It was deemed a low priority ticket since there was still an “Add here” button that worked properly.
This ticket has been submitted to Sitecore for their internal team to fix.