NextGen Gallery conflicts with https

Hi,

i’m using last official stable wordpress version with nextgen 2.0.66.31 (https://wordpress.org/plugins/nextgen-gallery/) and https plugins 3.3.6

When I create an article, click on the nextgen button to add gallery, a pop-up open but it stays blank inside.

I’ve tried to disable all other pllugins and enable one by one, and problems appears only when https plugin is loaded. Loading all others with https disabled let nextgen working, so, I deduce the problem comes from incompatibility between https and nextgen.

Could you please give me some indications to debug this ?

regards,

PS : related post here https://wordpress.org/support/topic/nextgen-gallery-conflicts-with-https?replies=1#post-6256187

https://wordpress.org/plugins/wordpress-https/