I've found the same problem as ukki.

$ /opt/qspot/bin/qspot
> set_stream 'QSpot'
FATAL ERROR: Could not initiate session. Error reason: "Unable to open trace file"
Segmentation fault
~ $

I've deleted (moved away) /home/.config/qspot/qspot.conf and the result is the same, and file is not re-created.

So I've created an strace output file for you to be able to debug better this behaviour.

~ $ strace -o MyDocs/qspot.strace /opt/qspot/bin/qspot

(attached, gzip compressed, qspot.strace.gz)

Thanks for this great app I use almost every day!
Rafa.