VOB2MPG Encode Failure

[MutantPlatypus]

So I'm trying to do the typical VOB2MPG thing plus recalculate GOP timecodes. The DVDs I'm working with are distance-learning classes from my school, so they are not encrypted but probably don't follow all the typical DVD rules. On some discs, the last chapter doesn't finish transcoding. I get the following exception:

Version: VOB2MPG PRO
Build: 3.2.2000
  
Type: System.IndexOutOfRangeException
  
Source: VOB2MPG
  
Message: Index was outside the bounds of the array.
  
InnerException: 
  
StackTrace:    at VOB2MPG_PRO.VOBConverter.x25e9ea9186f9d644.Write(Byte[] array, Int32 offset, Int32 count)
   at VOB2MPG_PRO.VOBConverter.xa4923bf9ed944f6a.x5efa887f424cce7c(x0010d7171147daf4 xb867a42da3ae686d)
   at VOB2MPG_PRO.VOBConverter.xa4923bf9ed944f6a.xf098323036d9ec26(String x0fb01370f21139f0)
   at   VOB2MPG_PRO.VOBConverter.xa4923bf9ed944f6a.xa0a575fb460f53aa(String   x37a96021dbbe3532, String x0fb01370f21139f0, String xd8195b3904c80823,   Boolean xf140bfb3a6ec89d8)

And the log file:

********************************************************************
************************ SYSTEM INFORMATION ************************
********************************************************************

***************************** VOB2MPG *****************************

Name: VOB2MPG PRO
Title:  PRO
Version: 3.2.2000
Executable: C:\Program Files (x86)\VOB2MPG PRO\VOB2MPG.exe
Executable size: 920 KB
Executable size in bytes: 942675
Executable CreationTime: 11/24/10 15:54:16
Executable LastWriteTime: 9/12/11 02:25:22
Executable LastAccessTime: 9/12/11 02:25:22
****************************** Drives *******************************

DeviceID: C:
FileSystem: NTFS
Size: 581 GB
FreeSpace: 466 GB

********************************************************************
********************* END OF SYSTEM INFORMATION ********************
********************************************************************

 /v="C:\ECE648SM11_05_01" /t=1 /o="C:\Users\Greg\Videos\ECE-648\Title_1.mpg"
11:47:55  
Extracting from Title: 1

11:47:55  
11:47:55  =============== Virtual File Details ===============
11:47:55  
11:47:55  VTS_01_1.VOB : Length = 1105920 (1.05 MB) : vPosition = 1105920 (1.05 MB)
11:47:55  
11:47:55  =============== Virtual File Details ===============
11:47:55  
11:47:55  Extracting chapter: 1...
11:47:55  Start position: 0     End position: 737280
11:47:55  Start position: 737280     End position: 1105920
11:48:00  Finished Processing...
11:48:00  Duration (hh:mm:ss): 00:00:04

This is only on some discs, and at different points in the last chapter for each disc. This happens regardless of whether I'm using the original DVD as the source or if I copy the DVD to the hard disk using DVD Shrink. The discs can be previewed in full, without errors, in the VOB2MPG viewer and PowerDVD 10.

The exception and log file above is for a shortened part of the video copied using DVD shrink. Since the clip is only three seconds long, I've attached the entire "shrunk" DVD and the MPG output.

[MutantPlatypus]

Since this seems to have stumped people, I'll ask for a workaround instead: How can I use the "position" given in the log file to determine at what hour, minute, second, and frame the video is causing problems? If I knew that, I could just use DVD Shrink to re-author the DVD and drop out that one frame.