Rawtherapee crashes on launch

Rawtherapee crashes leaving a core dump which fed to gdb gives the following :

Reading symbols from /usr/bin/rawtherapee...
Reading symbols from /usr/lib/debug/usr/bin/rawtherapee.debug...
[New LWP 25580]
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib64/libthread_db.so.1".
Core was generated by `/usr/bin/rawtherapee'.
Program terminated with signal SIGSEGV, Segmentation fault.
#0  0x00007f5b301e6300 in Glib::ustring::ustring(Glib::ustring const&) () from /lib64/libglibmm-2.4.so.1

No idea what it means, it’s something of a miracle I got this far.

Neither RT nor libglibmm have been updated recently - I tried re-installing RT when I realised it wasn’t working any more.
I can only think that this collateral damage of something else being updated.

This is a known bug:

https://bugzilla.opensuse.org/show_bug.cgi?id=1259664

Upstream (Rawtherapee developers) are trying to fix it.