Instagram images pulled via HTTPS not displaying.
The source of the problem is AKAMAI.
Their SSL Certificate is reported to be invalid. Thus Chrome/Firefox/Safari does not load images.

To temporarily fix this issue you can use this short code snippet:

var src = '//igcdn-photos-e-a.akamaihd.net/hphotos-ak-prn/'+oldsrc.split('/').pop();

UPD: issue fixed, no need to change the urls 😉