The loader spinning animation is not displayed properly in the latest chrome browser, Version 66.0.3359.139 (Official Build) (64-bit)
Open this link in latest chrome browser to see the issue
https://semantic-ui.com/elements/loader.html
I just tested this on 66.0.3359.139 (Official Build) (64-bit) and its working for me.
It is an issue with a Chrome extension: Loom - Video Recorder
https://chrome.google.com/webstore/detail/loom-video-recorder-scree/liecbddmkiiihnedobmlmillhodjkdmb
It interferes with the spinning animation of the loader.
Thank you for figuring out what was causing this! I was having the same issue.
Most helpful comment
It is an issue with a Chrome extension: Loom - Video Recorder
https://chrome.google.com/webstore/detail/loom-video-recorder-scree/liecbddmkiiihnedobmlmillhodjkdmb
It interferes with the spinning animation of the loader.