ABI compatability broke but SO version not bumped 1.43→1.44
The recent release of Pango 1.44 (which hit me on Arch Linux last week) has wreaked havoc with Lilypond, which is no longer usable. Because there was no version bump to the SO module, it does not throw an error at runtime, but the resulting output is garbage. Dropping the 1.43 so module back onto the system fixes everything.