Thank you,
When i change Theme options > Isotopic Results > Display animation >
I can see that the date of the file /wp-content/uploads/asp_upload/style.instances.css is updated.
However if i change the setting lightspeedout to something else like rotatein, even if the date of the file is updated the code is strictly identical (looking directly on the server throught ssh).
If i change the result box backgound color on the same setting page it’s working.
I’ve desactivated all the cache / cdn etc ..
Thank you for your help,