my session drummer 2 stopped working, sonar 7xl home studio, don't know what happened all of the sudden, it just stopped, when I load up a rhythm section from its library, there is nothing going on not a sound when I click on any of the drum icons or when I click on the sample loops button, whats going on here ???

And all other audio is normal? Is this only in one project, or any old or new projects?
 
You have double checked track ins/outs, drivers, rec/playback timing masters, etc?
No activity in any meters?

Double