Did you use smxi to install nVidia drivers? I would just use smxi again to install the nVidia drivers or whatever method you used to install them...
I am not too sure if the issue is related to libpango
I just did a total dist-upgrade and never saw this... is libpango part of a package you installed?
FWIW, I always keep my version and do not let the maintainers package update it, or I look at the differences and decide from there