User blog comment:DaNASCAT/Technical Update: November 11, 2015/@comment-4551144-20151111210416/@comment-126761-20151112152702

That image is showing for me at the moment, but if you were seeing the generic 'broken image' thumbnail - yes, it's likely related.

The main issue is/was seeing "mwstore" errors when trying to upload, but it had some knock-on effects that delayed thumbnails being generated for some images. The team are continuing to monitor and improve the situation.