Amazon S3 is currently experiencing an outage, which affects some parts of WarLight, since WarLight is hosted on Amazon servers.
More info: https://techcrunch.com/2017/02/28/amazon-aws-s3-outage-is-breaking-things-for-a-lot-of-websites-and-apps/
Specifically for WarLight, it will break some images and some maps. It will mostly affect maps that aren't downloaded frequently, since frequently used maps get cached on a CDN and won't need to be accessed from S3.
The good news is that Amazon is working hard to fix the problem and I suspect it will all be working again soon.