At the moment it seems that thumbnails of images are not always rendered correctly. I saw some complaints popping up on nl-wikipedia so looked a bit around. For example in this article:
https://nl.wikipedia.org/wiki/%C4%BDubom%C3%ADr_Ft%C3%A1%C4%8Dnik
The image, https://commons.wikimedia.org/wiki/File:Ftacnik_lubomir_20081025_berlin_bundesliga.jpg, is not displayed. nl-wikipedia generated thumbnails in infoboxes with a default of 264px. When looking on commons, the 263px and the 265px were decently generated, but the 264px one doesn't display, not even after a purge.
The second one I saw was the map on this article:
https://nl.wikipedia.org/wiki/Xiongnu
the image being: https://commons.wikimedia.org/wiki/File:Hsiung-nu-Empire.png
Can this been looked into, it seems some caching is broken, and some broken image files are in the way or something alike.
Version: unspecified
Severity: major