Same issue here as Karine explained. The bug was reported 4 months ago and here we are, upgraded glib yesterday [libglib2.0-0:amd64 (2.74.6-2, 2.76.4-3)] and Openbox (3.6.1-10) is quite unusable.
Despite the icculus bug report seems to be a bit in an unknown state isn't the patch good enough to be applied?
