I have "Enable MIDI Out" on some softsynths that I am using to trigger other synths.   Problem is, this MIDI out data seems to be going to other tracks I don't want it to (even if my USB keyboard is selected as the MIDI Input on these tracks).
 
The numerous MIDI issues with Sonar is making it almost impossible for me to work like this.

Here is what I have:

TRACK 1: Kirnu Cream (Arp/Sequencer) --> MIDI OUT --> Track 2
TRACK 2:  Z3TA+2 (being controlled by TRACK 1 above)
TRACK 3:  Kirnu Cream (Arp/Sequencer) --> MIDI OUT --> Track 4
TRACK 4:  Cakewalk Dimension Pro (being controlled by TRACK 3)

Yet, Track 1 midi out is making it into Track 4!!!

This is driving me up a wall.  Any help is greatly appreciated.

Your track naming convention is strange. Why does track 3 have "Track 1: Synth1:" in its name?
 
Can you reproduce the problem in a new project using standard synths that are included in Sonar? If so, you can share the problem project to see if others experience the same thing when using your project.

EddieLotter
Your track naming convention is strange. Why does track 3 have "Track 1: Synth1:" in its name?
 
Can you reproduce the problem in a new project using standard synths that are included in Sonar? If so, you can share the problem project to see if others experience the same thing when using your project.

typo - fixed it.
 
yes i can reproduce with just Sonar synths.   I will share soon.