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Hi Rui, thanks a lot for your patience and great work. Primarily , as I sayd before, Is mdaEpiano the plugin who make qtractor segfault. This happens every time I open my project, with:
- 8 midi tracks an 2 audio tracks.
In the midi tracks I'm using:
- mdaEpiano (Linux-VST) ,
- 3 instances of WhySynth (one per track),
- Nekobee with two ladaspa fx (Caps Preamp IV, Caps mono compressor).
- I also had Calf Vintage Delay, forgeted, in a midi track , that had another mdaEpiano instance but unloaded now.

If I open the project without mdaEpiano, everything runs fine.
When I charge mdaEpiano seems to works fine untill it crashes.
Them , launch again Qtractor , unload the plugin and reload again, it seems to work .
I save the project with the loaded plugin, close Qtractor and launch again (with the plugin loaded). Back to begine... when I push play, the cursor, at the first note of the mdaEpiano track stop and crashes .
So each time I open the project with mdaEpiano in any track, it will crash until I unload and recharge the plugin again , but Qtractor will crash again after a while.

Steps to reproduce:
1.- Create a track on an empty project
2.- Load mdaEpiano in a midi track.
3.- Write some notes.
4.- Playback the track many times.
5.- After some playbacks Qtractor crashes.

Here is the backtrace:

http://pastebin.com/f73d00860

As you say :

One thing I do know already though, the mdaPiano native VST plugin is not what one might call rock-solid stable. At least in my limited experience. Others may vary ;)

Probably its nothing related to Qtractor.

I'm using Hydrogen with this project and Jack 0.116.1 .

Thanks a lot.