Banner Notifications Not Displaying in Mountain Lion

I am running DTPO 2.4 under Mountain Lion and have DT configured in Notification preferences to show alerts. It only worked one time but the rest of the tie I see no alerts on the screen even though they are recorded in the Notification sidebar when I open it up. Ditto when I set banners.

They are working now but very hit and miss… sometimes I get a notification and sometimes I dont…configured now as Banners