Hi, thank you for adopting Hydrogen :) Yes, it still happens with 0.9.7-6 (not tried upstream git sources).
Maybe the severity can be lowered, I've been using Hydrogen with the workaround of choosing samples in advance, never deleting layers when building an instrument, and it works. It seems that deleting a layer is the most risky task, probably when the sound is still playing. Can't you reproduce it? It only took a few seconds to crash it, just a minute before writing this email. If this only happens to me, we could close the bug, though I wonder why are only my computers triggering the crash :/
