Good morning,
I have the same problem as the Op, but I can't solve it.
First of all, I'm on a local server doing test.
I do what this tutorial says:
https://www.axew3.com/w3/2016/02/embed-p ... esponsive/
I have modified the html before changing the ecompile stale style components.
I have modified the html after modifyng the ecompile stale style components.
I have added the script after <!-- EVENT overall_footer_after -->
I have added the scripto before <!-- EVENT overall_footer_body_after -->
I have added the script before </body>
I have added the script two,or even 3 times on html to see if there was any change.
And,of course, the changin of Recompile stale style components did I too.
I have iframeResizer.contentWindow.min.js on all this folder:
root folder of all.
special folder named "scripts" on root,and changed the html to there (nothing too).
On phpbb3 root folder ( in my case, I have changed the name to "forum",so this folder is on www_public/forum/)
I have it on the folder of template from platesilver.
And allways the same for me.
I know I'm doing something incorrect, but don't know what...I even deleted all the .js and reupload the original template .html file and restarted again....
Thank you very much.
PS:I cleared the coockies and cache from my browsers too (chrome and firefox).