Everything was working fine, then I installed a new plugin from Waves, the Audio Track v9 and suddenly I get NO sound when I use a synth of any kind withing SONAR.  Using Rapture Pro stand alone works fine.
 
Any ideas?

I should add that all the MIDI device connections appear to be the same as they were.  I'm no MIDI expert but it looks right.

Ok, I'm stumped here.

Any good places to start troubleshooting?

I have to delete TTSSEQ.INI every time I run Sonar now... then re-choose my Midi Device under Midi/Devices. After that it works fine. Try that :)
 
Bill

Just check to make sure your devices are still there (In Preferences/Midi devices)
then check the routing on your tracks (Input/output).
Can you see midi activity in the track meters ?

Cookie Jarvis
I have to delete TTSSEQ.INI every time I run Sonar now... then re-choose my Midi Device under Midi/Devices. After that it works fine. Try that :)
 
Bill

I'll check into that when I get home from work, thanks.

chuckebaby
Just check to make sure your devices are still there (In Preferences/Midi devices)
then check the routing on your tracks (Input/output).
Can you see midi activity in the track meters ?

That's the thing, I wasn't seeing anything coming from my keyboard.  But it IS coming into the computer since the stand alone version(s) work fine.  Very strange. 

I was tired and a bit cranky last night so I plan to hit this again when I get home from work with a better outlook.  It's got to be something simple, right?

chuckebaby
Just check to make sure your devices are still there (In Preferences/Midi devices)
then check the routing on your tracks (Input/output).
Can you see midi activity in the track meters ?

It all looks right.  Doesn't work if I select either a Single Instrument Track or a MIDI track and a separate audio output track.  It is simply not receiving input from my keyboard suddenly.  If I hit a pad on the Korg PAD Kontrol I have with the input set to All Inputs/Omni I get sounds.  Just not my keyboard.  The funny thing is that the keyboard works fine in Reason and when I use any of Cakewalk's synths in stand-alone mode.  Frankly, it's kind of pissing me off right now.

Ok, not that it's a hot topic but for anyone searching this in the future, I got it sorted.

Turns out that somehow (Lord knows how) the one Control Surface I had setup which was the Play/Stop/FF/RW keys on my Yamaha MO8 keyboard got the input set from MIDI port 4 to 1, so it must have been gobbling up the keystrokes.  Reset that to 4 and Boom, everything works again.