Session Drummer x64 No Sound after hitting 'play'

So here's the problem,
 
I was working on drums tracks for a few hours yesterday using Session Drummers 'step sequencer'.
Everything was working fine, no real problems.
All of the sudden the drums stopped working on playback and even when using my KeyRig to manually play the drums there was no sound.
 
Today I've been trying to figure it out with no luck.
I believe everything is routed properly because when I open a new Session Drummer track and select my kit everything works fine. The KeyRig is functioning and Session Drummer is responding properly. But when I load my pattern and hit play, the sound on my drum track is dead, the KeyRig no longer makes sound, and my range meter doesn't light up either.
When the track plays it shows the drum kit in Session Drummer being played but still no sound.
Like I said, the problem only persists after hitting 'play'.
 
Please help!
 
 

try resting the midi engine, if that fails, close/open the project.
 

So another update.
 
Only the patterns that I have created myself using the Step Sequencer don't play back.
All the other saved patterns that come with Sonar work fine

try right clicking on your clip and select bounce to clips, this will turn your step seq. clip into a midi clip.
this may possibly be a reason.
im still a little confused here about what's happening.
 
try opening a whole new project first to make sure its not a data issue.
try inserting session drummer and verify that it works correctly.
 
if it does than its some setting you may have moved.
or maybe you've routed the session drummer vsti to another track.
 
check all your I/O's (inputs/outputs)
make sure the midi track is indeed feed by the midi.
 
in the meantime here's a few videos I made on session drummer, basic midi, Exc.
just watch and see if it all looks like what your doing is correct.
 
basic midi in session drummer, studio drummer
http://www.youtube.com/watch?v=k83UVo1OiKA
 
3 ways to midi
http://www.youtube.com/watch?v=juIu9Rlt6v8
 
 

To clear it up - My self made SSP files/ patterns are muting my Session Drummer entirely when selected and played back. Someone please help before there is no hair left on my head!