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The beta crashes about two seconds after I start it on my system. Here is my dxdiag. Hope this helps.

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System Information
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Time of this report: 12/9/2010, 15:50:21
Machine name: HAL9000
Operating System: Windows 7 Home Premium 64-bit (6.1, Build 7600) (7600.win7_gdr.100618-1621)
Language: English (Regional Setting: English)
System Manufacturer: Gigabyte Technology Co., Ltd.
System Model: EP31-DS3L
BIOS: Award Modular BIOS v6.00PG
Processor: Intel(R) Core(TM)2 Duo CPU E8400 @ 3.00GHz (2 CPUs), ~3.0GHz
Memory: 4096MB RAM
Available OS Memory: 4094MB RAM
Page File: 1235MB used, 6951MB available
Windows Dir: C:\Windows
DirectX Version: DirectX 11
DX Setup Parameters: Not found
User DPI Setting: Using System DPI
System DPI Setting: 96 DPI (100 percent)
DWM DPI Scaling: Disabled
DxDiag Version: 6.01.7600.16385 32bit Unicode

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Display Devices
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Card name: NVIDIA GeForce GTX 470
Manufacturer: NVIDIA
Chip type: GeForce GTX 470
DAC type: Integrated RAMDAC
Device Key: Enum\PCI\VEN_10DE&DEV_06CD&SUBSYS_14723842&REV_A3
Current Mode: 1600 x 900 (32 bit) (60Hz)
Monitor Name: SyncMaster 2033SB,SyncMaster Magic CX2033SB(Digital)
Monitor Model: SyncMaster
Monitor Id: SAM0498
Driver Name: nvd3dumx.dll,nvwgf2umx.dll,nvwgf2umx.dll,nvd3dum,nvwgf2um,nvwgf2um
Driver File Version: 8.17.0012.6089 (English)
Driver Version: 8.17.12.6089

A couple things will help narrow this down :

* Does the crash also occur when using the 4.1.037 Final B release?

* Does the crash occur if the Heads window is open? Does it occur if the Heads window is closed?

* Does the crash occur if the software is started without the TrackIR connected?

* Does the crash occur if there is no clip or other reflective/LED objects in the field of view of the TrackIR when starting the software?

* I see this is in the TrackIR 3 forum, but want to confirm which hardware type you are using. Is it a TrackIR 3, 4 or 5?

Hi, yes I use TIR3 with Vector expansion.To answer your questions

Never. (gone back to using it TIR completes me)
Doesn't get that far
Yes
Yes

I get this report from windows. Hope this helps narrow down the field.

roblem signature:
Problem Event Name: APPCRASH
Application Name: TrackIR.exe
Application Version: 0.0.0.0
Application Timestamp: 4cfd6e72
Fault Module Name: NPClient.dll
Fault Module Version: 3.2.38.0
Fault Module Timestamp: 4cfd6e78
Exception Code: c0000005
Exception Offset: 00001669
OS Version: 6.1.7600.2.0.0.768.3
Locale ID: 2057
Additional Information 1: 0a9e
Additional Information 2: 0a9e372d3b4ad19135b953a78882e789
Additional Information 3: 0a9e
Additional Information 4: 0a9e372d3b4ad19135b953a78882e789

Please check your private forum messages. We've sent a couple things for you to test which should help narrow it down further.