low or no mob spawns

started a fresh 1.7.4 world, on the plain I spawned in there were a few mobs that popped up , but as soon as i moved into a standard forest I have not seen anything but wolves. even crawling through caves I see one or two skeletons in 30 minutes .

I know this is the second time I reported this I can't be the only one seeing this problem

forced a crash . hope this info helps

Minecraft Crash Report ----
// Ooh. Shiny.

Time: 12/14/13 10:15 PM
Description: Manually triggered debug crash

java.lang.Throwable
at azi.p(SourceFile:1385)
at azi.ah(SourceFile:760)
at azi.f(SourceFile:711)
at net.minecraft.client.main.Main.main(SourceFile:152)

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

– Head –
Stacktrace:
at bka.a(SourceFile:289)

– Affected level –
Details:
Level name: MpServer
All players: 1 total; [bkf['MisterAtrophy'/434048, l='MpServer', x=-291.58, y=73.62, z=-679.26]]
Chunk stats: MultiplayerChunkCache: 40, 40
Level seed: 0
Level generator: ID 00 - default, ver 1. Features enabled: false
Level generator options:
Level spawn location: World: (-76,64,232), Chunk: (at 4,4,8 in -5,14; contains blocks -80,0,224 to -65,255,239), Region: (-1,0; contains chunks -32,0 to -1,31, blocks -512,0,0 to -1,255,511)
Level time: 243425 game time, 285304 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: 11 total; [vg['Sheep'/520767, l='MpServer', x=-337.50, y=85.00, z=-670.22], vg['Sheep'/520766, l='MpServer', x=-339.50, y=87.00, z=-672.50], vm['Wolf'/446674, l='MpServer', x=-290.06, y=72.00, z=-680.34], vg['Sheep'/698581, l='MpServer', x=-308.22, y=72.00, z=-638.78], vg['Sheep'/698580, l='MpServer', x=-306.50, y=72.00, z=-634.50], vg['Sheep'/698583, l='MpServer', x=-309.56, y=73.00, z=-636.44], vg['Sheep'/698582, l='MpServer', x=-309.09, y=72.00, z=-637.53], bkf['MisterAtrophy'/434048, l='MpServer', x=-291.58, y=73.62, z=-679.26], xh['Zombie'/526415, l='MpServer', x=-272.50, y=12.00, z=-706.50], vg['Sheep'/520768, l='MpServer', x=-337.50, y=84.00, z=-671.81], vg['Sheep'/520769, l='MpServer', x=-338.50, y=84.00, z=-675.50]]
Retry entities: 0 total; []
Server brand: vanilla
Server type: Integrated singleplayer server
Stacktrace:
at bka.a(SourceFile:289)
at azi.b(SourceFile:1952)
at azi.f(SourceFile:720)
at net.minecraft.client.main.Main.main(SourceFile:152)

– System Details –
Details:
Minecraft Version: 1.7.4
Operating System: Windows 7 (amd64) version 6.1
Java Version: 1.7.0_45, Oracle Corporation
Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
Memory: 261216608 bytes (249 MB) / 523239424 bytes (499 MB) up to 954728448 bytes (910 MB)
JVM Flags: 2 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx1G
AABB Pool Size: 666 (37296 bytes; 0 MB) allocated, 3 (168 bytes; 0 MB) used
IntCache: cache: 0, tcache: 0, allocated: 12, tallocated: 94
Launched Version: 1.7.4
LWJGL: 2.9.1
OpenGL: GeForce 6150SE nForce 430/integrated/SSE2 GL version 2.1.2, NVIDIA Corporation
GL Caps: Using GL 1.3 multitexturing.
Using framebuffer objects because ARB_framebuffer_object is supported and separate blending is supported.
Anisotropic filtering is supported and maximum anisotropy is 16.
Shaders are available because OpenGL 2.1 is supported.

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)
Vec3 Pool Size: 2207 (123592 bytes; 0 MB) allocated, 19 (1064 bytes; 0 MB) used
Anisotropic Filtering: Off (1)