Ahh, I forgot to write:

just type 'run' and press enter. After that muse will start loading as 
usual. Make everything until it crash again - it will be like muse's 
arranger hangs. When it will happen, switch to gdb console and type 
'bt'+enter.

P.S. my copy is installing now.

>
> So when the crash occurs in MusE, then I type into the gdb console "bt",
> right?
Aha :)

Regards,
Andrew 
