So no unread count at all?
This feature was intended by Samsung only for their own apps -- it's completely undocumented and unsupported -- and as such, may or may not work.
( it amazes me how HTC, Samsung, other companies document all kinds of useless crap, but not this feature which so many people expect, especially after switching from iPhones where it is standard and official and documented )
Two possible workarounds:
- Using the app's widgets instead
- Switching to a third party launcher that officially supports this feature: Nova Prime, Apex Pro, Smart Launcher
There is more info on this in the FAQ.