Missing notes in Sonar 8.5 64 bit

On a recent project with Kontakt 3 64 bit and several step sequencers, there are notes missing on playback and render. The position of the notes is random. All instruments (6 of them) are very simple (one sample), disk activity should be minimal and cpus are (quad core) are about 30-40% in sonar.
Any suggestions? Who's to blame?

 

Yes, I ran into this same problem. And just by playing around, found a workaround that seems to fix the problem. I forget where it is but there is a MIDI buffer somewhere in the SONAR settings that I raised and the missing notes magically re-appeared. Do not confuse this with audio latency, the setting says some type of MIDI buffer that I raised.

Hope this helps you out,
Jim

 

As sugeested already-Global options\midi

Playback
Prepare Using N Millisecond Buffers. This option lets you specify how far in advance SONAR prepares MIDI data during playback. The default is 500 milliseconds.
If playback stops prematurely, you may try larger values (although you should also check the buffer options in Options > Audio, Advanced tab).
If you are using MIDI effects, you may want to try smaller values—for example, 100 milliseconds. Doing so means that, if you change a property for a MIDI effect, there will be less delay before you hear the new value take effect.