I want to add a “Click-Track”.
So I added a Track and routed it to the internal USM.
When I play the Song I realize, that the first note is occasionally dropped.
Can someone prove/reproduce that?
I moved the Midi-Event-Block one Bar to the right to test, if the issue is, that at the very beginning Midi-Event in a Song get dropped.
But even in the loop the first high C6 get dropped sometimes.
Why do I want to add a Click-Track?
I only need sometimes in the Song a guiding “Click” on my in-ears. So I don’t want to use the internal Metronome.
New findings:
When I extend the event at the beginning, it works and the first note is no longer dropped:
But this is more like a “workaraound”, than a fix… 
I just tried that and I’m not getting this behavior. I checked with the USM as well as with HALSonic.
Which version of VST Live are you using? And are you on Win or Mac?
@Kai_Schwirzke VST LIVE PRO3 - 3.0.50.218
Windows.
USM is on a global Layer, receiving on Channel 9; Sound Woodblock Tuned
Addition Tracks playing:
1 Video Track
1 Audio Track
I’m still using a Test-Licence, because I want to switch from vsthost to VSTLive. And now I am rebuilding my Live-Setups… 
Could you please try the latest build, available here?