The "Ogle Vigilante" map pushes H2 to its limits, but nothing (that I know of) disappears and an overflow error only occasionally shows when the map first loads.  Sometimes the weapons' sounds turn into Ogles singing, which is REALLY bizarre and I can't begin to understand why that happens.  If that happens to you, the only cure is to finish the map.

***If the game crashes when you try to save a new config, you can simply press Esc without saving.  Alternatively, you can copy a config you made/make in normal Heretic II from Heretic II/base/config to Oglequest/config and then load it in the game (which should automatically save it as your default config). Either way, you must exit the game first before playing; if you don't, the Ogle player model will show up as Corvus and the in-game messages and sounds will be drawn from the original game when they shouldn't be!