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Problem sending midi notes to external hardware in Ableton Live 9 Suite

I want to use Ableton Live 9 Suite to play some background tracks while performing live.
One track is configured to send midi notes to an external drum machine. This drum machine have a built in bass line that plays through a bass amp. I'm just interested in the bass line, wich is triggered on channel 8 of Ableton (and other sequencers).

The midi port (midi to USB device) is visible and set up as output on the track that I want to play through the bass. Everything seems set up correctly.
I can see the lights in Ableton when notes are playing, but the drum machine is not receiving this notes.

If I close Ableton, open Cubase SX (a 2004 version) and perform the same task everything works fine.
Then I close Cubase and restart Ableton and the problem is solved, Ableton is capable of triggering notes in the drum machine.

What's going on?

I know this is quite a basic task. I did it for years with Cubase without any problems.