This is what I do:
Insert soft synth > Superior drummer 3
Open the gui for SD3 and select a midi pattern
Drag the midi pattern from the SD3 gui into the Sonar track that contains SD3
If I play the pattern through SD3's gui, it plays all instruments. If i drag the midi file into Sonar and hit play in sonar, the toms are missing.
Like I said, I have been doing it this way for many, many years and have never experienced this issue before?