Same. I wanted to go back to refer to the build log of a plane I will be starting but the thumbnails are gone. However there are some pics from someone else posting in that thread. So images in that thread still works just cannot see any of the OP's images. Might be related to thread age and the repo containing thumbnails may have changed. Another build thread from the OP of the link below still has images showing in his more recent (2019) build thread.

This thread:
Sig Spacewalker II 1/4 scale

The funny thing is I was going to his build threads to go save all images to my PC before they disappear because I've seen this before. I am too late.

-Steve