Strange behaviour of services menu in some apps For my own purposes, I created service named "Launch Terminal" which, naturally, launches terminal. I've edited it few times, then renamed, moved to iCloud, then again edited and finally copied to a local machine. Now here's a problem:

Shortcut for this service is Command-Control-T. If a shortcut is set to this, then in Finder and Terminal applications, the shortcut doesn't work, while it works elsewhere. Moreover, when I open services menu in these two apps, I see entry "Launch Terminal" and it works only if clicked. No symbols, denoting key combination of shortcut are displayed in this menu, only the name of the service. The problem disappears if I set another key combination for this service or if I rename it. I tried rebooting several times and I tried rebuilding LaunchServices database with 

sudo /System/Library/Frameworks/CoreServices.framework/Frameworks/LaunchServices.framework/Support/lsregister -kill -r -domain local -domain system -domain user
Command-Control-T is used to add files/folders to Favorites Sidebar in Finder. May be you should try some other shortcut.