User blog comment:DaNASCAT/Technical Update: June 5, 2017/@comment-1824272-20170605195153

I've been encountering an issue where images with the quotation mark in the filename (", not the smart quotes) will convert that quotation mark to  when clicking on the image. This leads to the "Bad title" error page.

I've also been noticing some caching problems with images in general over the weekend. I hope those have been resolved, things seem to be smooth on that end now.