Here's a list of the issues that I've encountered. I hope that it helps to improve the engine.Sound.
There is often random pops when there should be silence. Parts of sounds will sometimes repeat. Some sounds are distorted, either seeming to play at a reduced quality, stuttering, or even pitch shifted. Ambient sounds can affect the volume of other sounds.Saving.
My settings don't load correctly. I had set the control and display settings to my preference, saved them to the VMU, and reset the game. Brightness seemed to be the only setting that was set correctly, though this only took affect upon loading the next level. I haven't tried saving my progress.Clipping.
Noticeable on open doors. It's now quite rare, but weapons can still clip through geometry. Entities can clip through the player's weapons and HUD. The plane object used to colour the screen will clip through the geometry.Warping Skies.
The sky layer warps when the player is moving.Menu.
At its default size, the dark background of the menu doesn't cover the entire screen, with a gap down the left hand side. There is clipping on some of the scroll bars. Text looks fine at all sizes, but menu images would benefit from set scaling so that their pixels remain square. Some elements don't show as off or on when altered (such as the crosshair, which still reads as "off" when on).Crosshair.
The position of the crosshair is altered by the screen size, with it only being in the correct position when the view window is fullscreen.Memory.
There is less useable memory in the version of 1.2 with the altered map loading, but I can't see the benefit of the new routine.Mouse Binding.
The mouse is useable, but its buttons cannot be reassigned in the options menu.Console Commands.
GL_PICMIP only seems to take affect when included in a config file. IMPULSE 9 only worked once for me, whereas you can usually enter it on every level.Culled Polygons.
The chaingun in ATF is rendered incorrectly in the latest version of 1.2, but appears correctly in the original build.
Here's videos of some of the issues. Some of the videos were made with the earlier build of 1.2, but all of the issues have been confirmed as existing in the latest build.
Sound popping :http://pipnayler.com/misc/sound-pop.mp4
Stuck sound :http://pipnayler.com/misc/sound-stuck.mp4
Ambient sound affecting volume :http://pipnayler.com/misc/sound-volume.mp4
Clipping on doors :http://pipnayler.com/misc/z-fight-1.mp4http://pipnayler.com/misc/z-fight-2.mp4
Clipping the screen :http://pipnayler.com/misc/z-clip-screen.mp4
Entities clipping the vweap and HUD :http://pipnayler.com/misc/z-clip-hud.mp4
Sky warping :http://pipnayler.com/misc/sky-warp.mp4
Clipping and distorted pixels on the menu :http://pipnayler.com/misc/menu.mp4
Incorrect positioning of the crosshair :http://pipnayler.com/misc/crosshair.mp4
The chaingun appearing incorrectly in the latest build of 1.2 (the door clipping video comes from the original build of 1.2, and the chaingun appears correctly in that) :http://pipnayler.com/misc/vweap.mp4
Here's what can happen when there's not enough memory for textures :http://pipnayler.com/misc/texture-memory.mp4
This video comes from the earlier build of nuQuake 1.2 and highlights the blurred menu images, warping sky, and bad sound :http://pipnayler.com/misc/menu-sound-sky.mp4