I've got an img element with an href inside it that contains an & character for a second URL parameter. It's a Google Maps static image API call, a la https://developers.google.com/maps/documentation/staticmaps. This breaks the subsequent syntax highlighting. I've installed the latest HTML edit mode, but it's still happening.
I'm on jEdit 5.1.0 server mode, running on Java 1.7.0_45.