Has anyone tried to burn a DVD made up of dvr-ms files using WDM (Windows
DVD Maker)?

I was able to do it with Beta 2 but with 5600 it hangs trying to load the
DVD menu screen and shuts down the program.

As for burning within MCE itself, after 6 hours burning a disc with 1 hour
of video, I was at 3%.

Here's all the fun system specs:

Operating System: Windows VistaT Ultimate (6.0, Build 5600)
(5600.vista_rc1.060829-2230)
Language: English (Regional Setting: English)
System Manufacturer: MICRO-STAR INTERNATIONAL CO., LTD
System Model: MS-7100
BIOS: Phoenix - AwardBIOS v6.00PG
Processor: AMD Athlon(tm) 64 X2 Dual Core Processor 4400+ (2 CPUs), ~2.2GHz
Memory: 2046MB RAM
Page File: 956MB used, 3360MB available
Windows Dir: V:\Windows
DirectX Version: DirectX 10
DX Setup Parameters: Not found
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Display
Card name: NVIDIA GeForce 7800 GT (Microsoft Corporation - WDDM)
Manufacturer: NVIDIA
Chip type: GeForce 7800 GT
Driver Version: 7.14.0010.9564 (English)
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Sound
Description: Speakers (Sound Blaster Live! 24-bit)
------------------------
Disk & DVD/CD-ROM Drives
------------------------
Drive: C:
Free Space: 91.4 GB
Total Space: 99.9 GB
File System: NTFS
Model: n/a

Drive: F:
Free Space: 205.1 GB
Total Space: 238.5 GB
File System: NTFS
Model: n/a

Drive: V:
Free Space: 63.6 GB
Total Space: 90.9 GB
File System: NTFS
Model: n/a

Drive: D:
Model: SONY DVD RW DW-G120A ATA Device


Drive: E:
Model: LITE-ON DVD SOHD-16P9S ATA Device


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System Devices
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Name: Hauppauge WinTV PVR PCI II (26xxx)