Parts Of Leaves Block Become White

Could not confirm. Is your display driver or Java version outdated?

Please force a crash by pressing F3 + C for 10 seconds while in-game and attach the crash report ([minecraft/crash-reports/crash-<DATE>-client.txt|http://hopper.minecraft.net/help/finding-minecraft-data-folder]) here.

Minecraft Crash Report ----
// Everything's going to plan. No, really, that was supposed to happen.

Time: 22/06/14 20:24
Description: Manually triggered debug crash

java.lang.Throwable
at blj.q(SourceFile:1539)
at blj.ap(SourceFile:861)
at blj.a(SourceFile:303)
at net.minecraft.client.main.Main.main(SourceFile:121)

A detailed walkthrough of the error, its code path and all known details is as follows:
---------------------------------------------------------------------------------------

– Head –
Stacktrace:
at bya.a(SourceFile:310)

– Affected level –
Details:
Level name: MpServer
All players: 1 total; [cby['MrCreeper166'/83, l='MpServer', x=224.53, y=71.00, z=-326.71]]
Chunk stats: MultiplayerChunkCache: 49, 49
Level seed: 0
Level generator: ID 00 - default, ver 1. Features enabled: false
Level generator options:
Level spawn location: 248.00,64.00,-228.00 - World: (248,64,-228), Chunk: (at 8,4,12 in 15,-15; contains blocks 240,0,-240 to 255,255,-225), Region: (0,-1; contains chunks 0,-32 to 31,-1, blocks 0,0,-512 to 511,255,-1)
Level time: 247363 game time, 2629 day time
Level dimension: 0
Level storage version: 0x00000 - Unknown?
Level weather: Rain time: 0 (now: false), thunder time: 0 (now: false)
Level game mode: Game mode: creative (ID 1). Hardcore: false. Cheats: false
Forced entities: 33 total; [yz['Sheep'/70, l='MpServer', x=277.53, y=67.02, z=-304.38], yz['Sheep'/65, l='MpServer', x=264.00, y=70.02, z=-287.00], zc['Squid'/5629, l='MpServer', x=275.38, y=57.00, z=-374.50], yz['Sheep'/72, l='MpServer', x=285.00, y=68.02, z=-286.00], yz['Sheep'/75, l='MpServer', x=284.00, y=67.00, z=-283.06], yn['Bat'/3333, l='MpServer', x=152.56, y=18.10, z=-327.25], yn['Bat'/4757, l='MpServer', x=217.41, y=42.47, z=-349.53], yn['Bat'/4158, l='MpServer', x=205.75, y=43.10, z=-334.44], yn['Bat'/4159, l='MpServer', x=233.97, y=37.00, z=-342.09], cby['MrCreeper166'/83, l='MpServer', x=224.53, y=71.00, z=-326.71], yn['Bat'/4754, l='MpServer', x=193.06, y=38.00, z=-337.56], zc['Squid'/5591, l='MpServer', x=267.41, y=57.75, z=-381.53], yz['Sheep'/38, l='MpServer', x=190.47, y=66.00, z=-330.75], yz['Sheep'/42, l='MpServer', x=191.75, y=66.00, z=-338.53], yz['Sheep'/43, l='MpServer', x=202.31, y=67.00, z=-352.88], yp['Chicken'/40, l='MpServer', x=191.31, y=68.00, z=-349.59], zv['item.item.egg'/41, l='MpServer', x=197.53, y=63.00, z=-348.44], yz['Sheep'/46, l='MpServer', x=194.09, y=67.00, z=-327.94], yp['Chicken'/47, l='MpServer', x=181.63, y=66.00, z=-318.31], yp['Chicken'/44, l='MpServer', x=228.28, y=62.66, z=-344.41], zc['Squid'/5592, l='MpServer', x=273.50, y=56.00, z=-375.50], yp['Chicken'/45, l='MpServer', x=227.16, y=63.00, z=-334.50], yp['Chicken'/51, l='MpServer', x=234.63, y=66.02, z=-289.72], yp['Chicken'/50, l='MpServer', x=247.28, y=68.00, z=-324.28], yp['Chicken'/49, l='MpServer', x=233.94, y=66.00, z=-307.69], yz['Sheep'/55, l='MpServer', x=232.34, y=66.00, z=-307.47], yz['Sheep'/54, l='MpServer', x=244.66, y=67.02, z=-296.34], zc['Squid'/6824, l='MpServer', x=183.78, y=61.09, z=-278.09], yz['Sheep'/53, l='MpServer', x=243.00, y=67.00, z=-307.06], zc['Squid'/6822, l='MpServer', x=193.78, y=57.34, z=-278.84], zc['Squid'/6823, l='MpServer', x=185.06, y=59.47, z=-282.84], zc['Squid'/6821, l='MpServer', x=188.38, y=58.66, z=-277.19], yp['Chicken'/56, l='MpServer', x=246.56, y=68.02, z=-290.50]]
Retry entities: 0 total; []
Server brand: vanilla
Server type: Integrated singleplayer server
Stacktrace:
at bya.a(SourceFile:310)
at blj.b(SourceFile:2134)
at blj.a(SourceFile:312)
at net.minecraft.client.main.Main.main(SourceFile:121)

– System Details –
Details:
Minecraft Version: 14w25b
Operating System: Windows 7 (x86) version 6.1
Java Version: 1.7.0_55, Oracle Corporation
Java VM Version: Java HotSpot(TM) Client VM (mixed mode), Oracle Corporation
Memory: 74707624 bytes (71 MB) / 226635776 bytes (216 MB) up to 1037959168 bytes (989 MB)
JVM Flags: 2 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx1G
IntCache: cache: 0, tcache: 0, allocated: 13, tallocated: 95
Launched Version: 14w25b
LWJGL: 2.9.1
OpenGL: Intel Pineview Platform GL version 1.4.0 - Build 8.14.10.2364, Intel
GL Caps: Using GL 1.3 multitexturing.
Using GL 1.3 texture combiners.
Not using framebuffer objects because OpenGL 1.4 is supported, EXT_blend_func_separate is supported, OpenGL 3.0 is not supported, ARB_framebuffer_object is not supported, and EXT_framebuffer_object is not supported.
Shaders are not available because OpenGL 2.1 is not supported, ARB_shader_objects is not supported, ARB_vertex_shader is not supported, and ARB_fragment_shader is not supported.

Is Modded: Probably not. Jar signature remains and client brand is untouched.
Type: Client (map_client.txt)
Resource Packs: Default
Current Language: English (US)
Profiler Position: N/A (disabled)

This is a technical support issue; this site is for bug reports only. For technical support please use the Mojang Support Center.

Also, you might want to look into a better GPU, since yours is way too weak.