I have the exact same problem on two of my computers, different configuration but both have had problem with Quicktime updates. I have tried to solve the problem through downgrading the version of Quicktime to 7.4.1 it has been working on other computers before but not this time unfortunately.
The Navigator stops updating and disappears when I move the 3D-model around.
Configuration on computers, one working and one dont:
Operating System: Windows XP Professional (5.1, Build 2600) Service Pack 3 (2600.xpsp.080413-2111)
Language: Swedish (Regional Setting: Swedish)
System Manufacturer: Dell Inc.
System Model: OptiPlex GX280
BIOS: Phoenix ROM BIOS PLUS Version 1.10 A08
Processor: Intel(R) Pentium(R) 4 CPU 2.80GHz
Memory: 3070MB RAM
Page File: 475MB used, 3975MB available
DirectX Version: DirectX 9.0c (4.09.0000.0904)
The only thing different is that the pagefile is larger on one of the stations.
Then there is two different drivers for the graphiccard but that is because I have updated the one having trouble to see if that could be a possible solution but it doesnt seem to be any solution.
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Display Devices
Card name: ATI Radeon X300/X550/X1050 Series
Manufacturer: ATI Technologies Inc.
Chip type: ATI Radeon Graphics Processor (0x5B60)
DAC type: Internal DAC(400MHz)
Device Key: Enum\PCI\VEN_1002&DEV_5B60&SUBSYS_04021002&REV_00
Display Memory: 128.0 MB
Current Mode: 1680 x 1050 (32 bit) (60Hz)
Monitor: Plug and Play-bildskärm
Monitor Max Res: 1600,1200
Driver Name: ati2dvag.dll
Driver Version: 6.14.0010.6734 (English)
DDI Version: 9 (or higher)
Driver Attributes: Final Retail
Driver Date/Size: 11/2/2007 06:09:00, 268288 bytes
The other computer not working:
Operating System: Windows XP Professional (5.1, Build 2600) Service Pack 2 (2600.xpsp_sp2_qfe.070227-2300)
Language: Swedish (Regional Setting: Swedish)
System Manufacturer: Dell Inc.
System Model: Precision WorkStation T3400
BIOS: Phoenix ROM BIOS PLUS Version 1.10 A03
Processor: Intel(R) Core(TM)2 Duo CPU E6550 @ 2.33GHz (2 CPUs)
Memory: 3070MB RAM
Page File: 883MB used, 4071MB available
DirectX Version: DirectX 9.0c (4.09.0000.0904)
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Display Devices
Card name: NVIDIA Quadro FX 1700
Manufacturer: NVIDIA
Chip type: Quadro FX 1700
DAC type: Integrated RAMDAC
Display Memory: 512.0 MB
Current Mode: 1680 x 1050 (32 bit) (60Hz)
Monitor: Plug and Play-bildskärm
Monitor Max Res: 1600,1200
Driver Name: nv4_disp.dll
Driver Version: 6.14.0011.6926 (English)
DDI Version: 9 (or higher)
Driver Attributes: Final Retail
Driver Date/Size: 1/13/2008 20:31:22, 5773440 bytes