I have always used Ctrl+comma to insert tags (or acronyms, numbers etc) in a text and ctrl+fullstop to close passages within tags. I seem to have deactivated that function or it simply stopped working....any clues/ideas? thanks

I have always used Ctrl+comma to insert tags (or acronyms, numbers etc) in a text and ctrl+fullstop to close passages within tags. I seem to have deactivated that function or it simply stopped working....any clues/ideas? thanks