Blender 2.5 Alpha on OSX snow leopard 10.6.2

Please help!!

I have downloaded Blender 2.5 Alpha for my mac and when I open it I can see the main menu border and then it closes.

2.49 runs fine

Here is the details of the error.

Process: blender [1855]
Path: /Applications/Blender5/blender.app/Contents/MacOS/blender
Identifier: org.blenderfoundation.blender
Version: 2.5-alpha0 (2.5-alpha0, 2009-Nov-23, Blender Foundation)
Code Type: X86-64 (Native)
Parent Process: launchd [165]

Date/Time: 2009-11-26 12:10:23.052 +0200
OS Version: Mac OS X 10.6.2 (10C540)
Report Version: 6

Interval Since Last Report: 152899 sec
Crashes Since Last Report: 5
Per-App Interval Since Last Report: 17 sec
Per-App Crashes Since Last Report: 5
Anonymous UUID: AE17FEE9-FF85-47E9-970E-544E7D0B6578

Exception Type: EXC_BAD_ACCESS (SIGSEGV)
Exception Codes: KERN_INVALID_ADDRESS at 0x0000000000000030
Crashed Thread: 0 Dispatch queue: com.apple.main-thread

Thread 0 Crashed: Dispatch queue: com.apple.main-thread
0 org.blenderfoundation.blender 0x000000010048d3e4 BKE_ptcache_ids_from_object + 772
1 org.blenderfoundation.blender 0x000000010048faf1 BKE_ptcache_quick_cache_all + 129
2 org.blenderfoundation.blender 0x0000000100007160 wm_event_do_notifiers + 1056
3 org.blenderfoundation.blender 0x0000000100003d58 WM_main + 40
4 org.blenderfoundation.blender 0x0000000100002fbd main + 2093
5 org.blenderfoundation.blender 0x0000000100002284 start + 52

Thread 1: Dispatch queue: com.apple.libdispatch-manager
0 libSystem.B.dylib 0x00007fff8031bbba kevent + 10
1 libSystem.B.dylib 0x00007fff8031da85 _dispatch_mgr_invoke + 154
2 libSystem.B.dylib 0x00007fff8031d75c _dispatch_queue_invoke + 185
3 libSystem.B.dylib 0x00007fff8031d286 _dispatch_worker_thread2 + 244
4 libSystem.B.dylib 0x00007fff8031cbb8 _pthread_wqthread + 353
5 libSystem.B.dylib 0x00007fff8031ca55 start_wqthread + 13

Thread 2:
0 libSystem.B.dylib 0x00007fff8031c9da __workq_kernreturn + 10
1 libSystem.B.dylib 0x00007fff8031cdec _pthread_wqthread + 917
2 libSystem.B.dylib 0x00007fff8031ca55 start_wqthread + 13

Thread 3:
0 libSystem.B.dylib 0x00007fff80302e9a semaphore_timedwait_signal_trap + 10
1 libSystem.B.dylib 0x00007fff803416e2 _pthread_cond_wait + 1015
2 com.apple.audio.CoreAudio 0x00007fff88755bbc CAGuard::WaitFor(unsigned long long) + 168
3 com.apple.audio.CoreAudio 0x00007fff8875814b CAGuard::WaitUntil(unsigned long long) + 185
4 com.apple.audio.CoreAudio 0x00007fff887562b5 HP_IOThread::WorkLoop() + 1369
5 com.apple.audio.CoreAudio 0x00007fff88755d57 HP_IOThread::ThreadEntry(HP_IOThread*) + 9
6 com.apple.audio.CoreAudio 0x00007fff88755c85 CAPThread::Entry(CAPThread*) + 125
7 libSystem.B.dylib 0x00007fff8033bf8e _pthread_start + 331
8 libSystem.B.dylib 0x00007fff8033be41 thread_start + 13

Thread 0 crashed with X86 Thread State (64-bit):
rax: 0x000000011908d820 rbx: 0x000000011908d820 rcx: 0x0000000000000000 rdx: 0x0000000000000000
rdi: 0x000000011908d8c0 rsi: 0x0000000000000000 rbp: 0x00007fff5fbff850 rsp: 0x00007fff5fbff820
r8: 0x00000001190fc0a0 r9: 0x00000001190fc0a4 r10: 0x000000000000000d r11: 0x000000011908d820
r12: 0x000000010397fe90 r13: 0x000000010397fdf0 r14: 0x0000000104842e30 r15: 0x00007fff5fbff8a0
rip: 0x000000010048d3e4 rfl: 0x0000000000010246 cr2: 0x0000000000000030

Binary Images:
0x100000000 - 0x101a7efe3 +org.blenderfoundation.blender 2.5-alpha0 (2.5-alpha0, 2009-Nov-23, Blender Foundation) <5AA5FBF6-9E9D-A6D3-28F5-FE48783BBA00> /Applications/Blender5/blender.app/Contents/MacOS/blender
0x102b3a000 - 0x102b61ff7 com.apple.audio.OpenAL 1.3 (1.3) <DC7C99D7-BBF7-C93F-7B1B-D88EAB2908ED> /System/Library/Frameworks/OpenAL.framework/Versions/A/OpenAL
0x102b6f000 - 0x102ea1fef com.apple.CoreServices.CarbonCore 861.2 (861.2) <39F3B259-AC2A-792B-ECFE-4F3E72F2D1A5> /System/Library/Frameworks/CoreServices.framework/Versions/A/Frameworks/CarbonCore.framework/Versions/A/CarbonCore
0x102f1a000 - 0x10360e537 com.apple.CoreGraphics 1.536.12 (???) <0DCA088B-0C6B-146F-0341-9E0212B5CA50> /System/Library/Frameworks/ApplicationServices.framework/Versions/A/Frameworks/CoreGraphics.framework/Versions/A/CoreGraphics
0x115d80000 - 0x115d9ffff GLRendererFloat ??? (???) <5868E7F1-BAC2-F896-9DAA-D5ABDFA9A7C2> /System/Library/Frameworks/OpenGL.framework/Resources/GLRendererFloat.bundle/GLRendererFloat
0x115e2f000 - 0x115e33fff com.apple.audio.AudioIPCPlugIn 1.1.2 (1.1.2) <4E3DABFF-191F-7E57-2A78-12E34D68FAC4> /System/Library/Extensions/AudioIPCDriver.kext/Contents/Resources/AudioIPCPlugIn.bundle/Contents/MacOS/AudioIPCPlugIn
0x115e38000 - 0x115e3efff com.apple.audio.AppleHDAHALPlugIn 1.7.9 (1.7.9a4) <BF34EAC4-DB6D-4EC0-F52F-2A87B90EBD55> /System/Library/Extensions