This started happening on a live site. I installed a staging site, a duplication, and it continues. Updating the styles is inconsistent, sometimes it does, sometimes it doesn’t. Refreshing the frame makes no difference I can tell in this inconsistent behavior.
Out of the blue, with no changes elsewhere I’m aware of, when I updated a selector, the browser slowed down and indicated “something’s wrong”.
This is happening consistently. I’ve not experienced it on any of the other sites I use Microthemer on.