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I think the easiest way is about having a core dump telling all its post-mortem secrets...

1. Rebuild it all from scratch, with:
   

     ./configure --enable-debug && make
   

2. Enable core dumps in a shell session:
   

     ulimit -c unlimited
   

3. From the same shell comman line, run the program until it crashes badly. You'll see something like this in the output when it happens:
   

     Segmentation fault (core dumped)
   

4. Locate the dumped core file. Depending on your environmental settings it might be just named core or something like core.1234 (1234 is the process-id number of the crashing program) located on the last directory the program was current.
   

5. Load the core dump file into gdb
   

     gdb ./qtractor /path/to/core
   

   at the gdb prompt just enter:

     gdb> bt
   

   or

     gdb> thread apply all bt
   

   and send the whole output to me.

HTH
--
rncbc aka Rui Nuno Capela