hello i use k2 2.7.0 (i can't update) and joomla 3.6.5
2 cases
i edit my categorie, if i add image (basic uploader or media manager) i have a strange result :
case 1
if already no image before it work
case 2
if an image was upload it doesn't work it ALWAYS display old image !!

more precise => image for this categorie is 12.jpg
i del it
edit my categorie, remove image and save
=> no image for this categorie
i upload new image
it always display 12.jpg the old
incredible bug
some idea ?

This is a caching issue.
Try clearing your browser's cache. If you are behind a CDN enable the timestamp setting which is located in K2's images settings.

ok thanks !

You 're welcome :)