Here is a bug I found which is reliably reproduced on my system.
I'm looking for someone to confirm the behavior.
emerge media-sound/hydrogen, USE=alsa archive jack ladspa lash osc portaudio portmidi pulseaudio -oss
1.) start the app and begin creating a pattern
2.) change RES from 8 to something else, like 16
3.) notice the pattern editor is missing its tick marks
4.) click anywhere in the pattern editor
* CRASH *
The 9999 version doesn't build currently as the patches in it won't merge.
Expected results, the app builds well and behaves normally without unexpectedly crashing.
Launching the app right from the terminal, to capture output seems to indicate there was a "Floating point exception"
Hydrogen 1.0.0- [Oct 2 2018] [http://www.hydrogen-music.org]
Copyright 2002-2008 Alessandro Cominu
Copyright 2008-2018 The hydrogen development team
Hydrogen comes with ABSOLUTELY NO WARRANTY
This is free software, and you are welcome to redistribute it under certain conditions. See the file COPYING for details.
(E) Effects::getPluginList Error loading the library. (/usr/lib64/ladspa/imp_1199.so)
(E) Effects::getPluginList Error loading the library. (/usr/lib64/ladspa/sifter_1210.so)
(E) Filesystem::check_permissions is not a file
(E) Sample::load Unable to read
Floating point exception