User blog comment:Kirkburn/Technical Update: August 5, 2015/@comment-3544775-20150805224156/@comment-126761-20150806143424

We noticed some other reports of the preference issue last night, and have made sure the team are aware - we'll get it sorted ASAP. It's proving a little more difficult than expected to wrangle all of the edge cases as we switch it to a new backend system - sorry about that.

I'll look into the background image issue - have you sent a report in to Special:Contact/bug about this?