Most likely you are trying to use it out of context, which is resulting in a blank result. Insert from index is a completely different function and is not a good indicator to troubleshoot this.
Ctrl + ' is definitely the shortcut. The only way it would not work is if you're out of context (IE there was no previous active record) or if you have a OnLayoutKeystroke trigger that is overriding the action.
Do you have a sample file we can confirm against?
I was testing this (not in true (context) so it was context not shortcut that was the issue -- Many thanks