1.9.0-beta6.3 features a whole raft fixes. More details can be found at the link in the news section.

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• Doomsday Engine 1.9.0-beta6.3 Released
• Doomsday Engine: 1.9.0-beta6.1 Released
• Doomsday Engine: 1.9.0-beta6 Released
• Doomsday Engine 1.9.0-beta5 Released

• Supports Windows, Linux/Unix, and Mac OS X operating systems.
• Hardware-accelerated 3D graphics (OpenGL) and sound effects (DirectSound3D).
• 16-player multiplayer over LAN or the internet.
• Dynamic lighting and shadow effects.
• 3D models and particle effects.
• Dynamic light effects and lens flares.
• Simple shadows for objects.
• Support for high-resolution textures and detail textures.
• 3D skyboxes.
• Quake-style runtime console for modifying settings and giving commands.