It should fix quite some enormous log spam, errors, wrong debug options, some debugs possibly not saving, as well as some people's problem not being able to enable Deferred with mid-range GPU's.
See the changelog for all the changes and tell me if your issue was fixed.
Lastly i made some quick comparison shots too, so i can remind you of the basic graphical differences.
Note: I tried using the same camera position and rotation, using scripted camera on the first 2 shots and manual positioning on the last 2 ones. I've also used exactly the same sky preset and used max graphics on both Viewers (except the last shot where Volumetric Light makes little sense). Both Viewers use different camera settings and the world rendering screen in the LL Viewer is slightly smaller in height which changes the field of view outside of your own field of view setting making it impossible to get the exact same shot, but they should suffice i suppose. Also clouds, freaking impossible to sync up in both viewers... ugh.
2.5 Alpha 2
Changed: Set Window Size floater layout and style to match the new stylings in Preferences.
Changed: Increment steps of SSAO Factor slider to 0.01 for greater precision.
Changed: Applied SSAO Factor increment changes to Machinima Sidebar slider too.
Changed: Display preferences layout for better readability.
Changed: Joystick floater (Flycam Setup) layout and title colors to comfort the style used in preferences.
Changed: Made feathering sliders spinners for easier and more precise control.
Changed: Camera, Keybinds and Sound preferences layout slightly for visibility.
Changed: Applied the new preferences layout to UI Colors preferences tab.
Changed: Trigger threshold for texture memory warning raised to 1024mb total.
Changed: Make SSR stronger.
Changed: Disallow Third Person Steering mode in Mouselook.
Changed: Toggle Third Person Steering Mode off when switching to Mouselook.
Changed: Version to 2.5 - Alpha 2.
Fixed: Warning in floater_window_size.
Fixed: Warning in preferences floater.
Fixed: Several warnings about missing fonts used for languages we don't even support anymore.
Fixed: Set Window Size resolution buttons not working.
Fixed: Compile error in render pipeline.
Fixed: Wireframe mode in Deferred.
Fixed: Almost everything being invisible in non-Deferred.
Fixed: High UI/Find Widget frame spikes and errors of wrong control types.
Fixed: Right-Click touch being greyed out at all times.
Fixed: Bottom buttons in Places floater not clickable.
Fixed: (Potential) Some people not being able to turn on Deferred due to incompatibility with forced advanced shader level 2. Keep forcing shader level 2 as option.
Fixed: bindTexture and enableTexture spamming into the millions.
Fixed: Loading presets causes the display to go all crazy and breaking the display panel.
Removed: 800x600 Resolution from Set Window Size floater.
Removed: Shadow Occlusion.
Removed: First shadow split offset. (Seems to fix the ugly double-shadow on some windlight presets)
Removed: RenderShadowType control call.
Misc: Some Vector4 implementation cleanups. VW still not triggering a callback.
Misc: Viewer care and feeding, cleanup and unbreaking more tiny stuff that will never make a difference.