I have yet to get around to testing this on my desktop, so this report is (at the moment) going to be limited to my laptop, running Windows 8.1.
Gibbing a zombie grunt with a shotgun works fine, as does the gluon and explosives - however, once the zombie grunt is dead, if the ragdoll has any contact with explosives or the tau cannon, it will crash the game. (Oddly the gluon gun - and sometimes the tau cannon - seems to fire through the corpse, rather than making contact with it)
Additionally, I don’t think this one has been reported or fixed yet - on the (very!) rare occasions when explosions halve zombie guards, it spawns a zombie scientist torso npc rather than a zombie guard torso. I have yet to encounter the halving behavior on the zombie grunt, so I don’t know if this is the case for them.