Items and Screen Glitching, Flashing

I was playing minecraft and clicked on the 'plus' button (green) then the screen turned black, I clicked the button again and it went back to the normal size, then the items started flickering and also the menu.

I forced a crash report.
---- Minecraft Crash Report ----
// Shall we play a game?

Time: 10/8/14 9:14 PM
Description: Manually triggered debug crash

java.lang.Throwable
	at bsu.r(SourceFile:1563)
	at bsu.as(SourceFile:877)
	at bsu.a(SourceFile:314)
	at net.minecraft.client.main.Main.main(SourceFile:120)


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

-- Head --
Stacktrace:
	at cen.a(SourceFile:308)

-- Affected level --
Details:
	Level name: MpServer
	All players: 2 total; [cio['TheMoonEmpress'/91440, l='MpServer', x=-442.23, y=63.00, z=422.85], cip['kfirhagemeier'/123311197, l='MpServer', x=-465.46, y=63.50, z=446.76]]
	Chunk stats: MultiplayerChunkCache: 81, 81
	Level seed: 0
	Level generator: ID 00 - default, ver 1. Features enabled: false
	Level generator options: 
	Level spawn location: -409.00,63.00,435.00 - World: (-409,63,435), Chunk: (at 7,3,3 in -26,27; contains blocks -416,0,432 to -401,255,447), Region: (-1,0; contains chunks -32,0 to -1,31, blocks -512,0,0 to -1,255,511)
	Level time: 52269046 game time, 40824000 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: survival (ID 0). Hardcore: false. Cheats: false
	Forced entities: ~~ERROR~~ ClassCastException: amj cannot be cast to java.lang.String
	Retry entities: 0 total; []
	Server brand: BungeeCord (git:BungeeCord-Bootstrap:1.8-SNAPSHOT:"1623fb6":997) <- Spigot
	Server type: Non-integrated multiplayer server
Stacktrace:
	at cen.a(SourceFile:308)
	at bsu.b(SourceFile:2252)
	at bsu.a(SourceFile:323)
	at net.minecraft.client.main.Main.main(SourceFile:120)

-- System Details --
Details:
	Minecraft Version: 1.8
	Operating System: Mac OS X (x86_64) version 10.9.5
	Java Version: 1.6.0_65, Apple Inc.
	Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Apple Inc.
	Memory: 81721296 bytes (77 MB) / 261451776 bytes (249 MB) up to 1060372480 bytes (1011 MB)
	JVM Flags: 5 total; -Xmx1G -XX:+UseConcMarkSweepGC -XX:+CMSIncrementalMode -XX:-UseAdaptiveSizePolicy -Xmn128M
	IntCache: cache: 0, tcache: 0, allocated: 13, tallocated: 95
	Launched Version: 1.8
	LWJGL: 2.9.2
	OpenGL: ATI Radeon HD 4670 OpenGL Engine GL version 2.1 ATI-8.24.16, ATI Technologies Inc.
	GL Caps: Using GL 1.3 multitexturing.
Using GL 1.3 texture combiners.
Using framebuffer objects because ARB_framebuffer_object is supported and separate blending is supported.
Shaders are available because OpenGL 2.1 is supported.
VBOs are available because OpenGL 1.5 is supported.

	Using VBOs: No
	Is Modded: Probably not. Jar signature remains and client brand is untouched.
	Type: Client (map_client.txt)
	Resource Packs: []
	Current Language: English (US)
	Profiler Position: N/A (disabled)

I attached pictures of some of the textures happening.