Thumbnail sizing / cropping wrong

Trying out the latest build, I’m having a problem with the thumbnails being sized wrong / cropped. On the main page they seem ok:
[Image: unnamed.jpg]

if i go into the Movies menu they get messed up
[Image: unnamed-1.jpg]

Any ideas what I’m doing wrong or how to fix this? I am running in a 21:9 aspect ratio, if that matters.