Ardour3 hangs while starting

Hi there,
since yesterday, Ardour 3.0 started refusing to load. When started in terminal, it hangs like that:
$ ardour3
bnd txt domain [gtk2_ardour3] to /usr/local/share/locale
Ardour3.1 (built using 3.1-18-g66ee2c8 and GCC version 4.7.2)
ardour: [INFO]: Loading default ui configuration file /usr/local/etc/ardour3/ardour3_ui_default.conf
Loading ui configuration file /usr/local/etc/ardour3/ardour3_ui_dark.rc

I’ve been already trying all things, closing applications etc., but also a reboot didn’t work. I’m looking forward for helpful solutions.

Greetings, Patrick

You will need to press Ctrl-c when it is hung in order to get a "backtrace" in the way that page describes. Then post a bug to