User blog comment:Kirkburn/Technical Update: October 26, 2015/@comment-25024589-20151027123916/@comment-126761-20151027135749

Regarding the CSS and JS editor highlighting - this also now obeys the syntax highlighting preference. We'd love feedback on this behaviour.

The final issue you mention is very odd. Could you send in more info to Special:Contact about this, with example links? We'll want to investigate this further.