I will fix this, however it won't be retroactive for existing installs, as it's a Custom Comcode tag.
You need to edit the Custom Comcode tag and change the replacement code from:
{$SET,VIDEO,{$PREG_REPLACE,(http://.*\?v=)?(http://youtu.be/)?
to
{$SET,VIDEO,{$PREG_REPLACE,(https?://.*\?v=)?(https?://youtu.be/)?
(Click to enlarge)
#1608 - Youtube Comcode doesn't support HTTPS
I will fix this, however it won't be retroactive for existing installs, as it's a Custom Comcode tag.
You need to edit the Custom Comcode tag and change the replacement code from:
{$SET,VIDEO,{$PREG_REPLACE,(http://.*\?v=)?(http://youtu.be/)?
to
{$SET,VIDEO,{$PREG_REPLACE,(https?://.*\?v=)?(https?://youtu.be/)?