Soundconverter not working

Dear community

Strange problem here since I never had any issues with soundconverter. I tried version 2.1.2 through 2.1.6 and every time the same line in my terminal:

Gtk-Message: Failed to load module “topmenu-gtk-module”
using Gstreamer version: 0.10.36
using 8 thread(s)
using gio
Queue start: 1 tasks, 3 thread(s).
Queue done in 0.004s (1 tasks)
Queue start: 1 tasks, 3 thread(s).
*** stack smashing detected ***: /usr/bin/python terminated

Soundconverter ist quitting without any output (tried this with mp3, wav and flac as well)
Any ideas?

Which version of Ubuntu MATE?

hello lah7
I’m working with Ubuntu MATE 15.10 64bit