Default [Q] Root Problem!!!!

I've a confusing problem It's the first time for me to root my android I've a Samsung Galaxy Note 2 N7100 with kitkat version 4.4.2 I've rooted it yesterday and I rooted it properly and I knew that I've a root access using Root Checker but the problem is that I can't make any app which need root work even though I granted it in SuperSu app and its binary is up to date usually two errors appears to me
*when I open an app (like: screen cast recorder) it says "there is something preventing the app from working"or it says "u don't have a root access!"I don't know where the problem is I tried several apps but the same problem........
plz I want help very fast......thanx in advance