Error creating script in MeGUI

[MrCommunistGen]

I'm using MeGUI 2.6.1012 and Avisynth 2.5.7 on Vista x64.
When I try to load a d2v file into Avisynth to create an Avisynth script it gives me this error (the last bit seems most important):

The file D:\Enc temp\output.d2v cannot be opened. Please make sure it is a valid AviSynth script and that AviSynth is properly installed.
You can check the validity of your script and AviSynth installation by opening the file in your favorite media player.
If that works, try opening the video in VirtualDub(Mod) as well. If the former works and the latter doesn't, install a YV12 codec.
Error message for your reference: Attempted to read or write to protected memory. This is often an indication that other memory is corrupt.

Since the file in question ISN'T an Avisynth script but a d2v I don't see why I'm getting this particular error. I first got this error when I installed MeGUI 2.6.1010 and had to revert to an older version, but I had been using 2.6.1012 for a while without incident until this morning. I've tried reinstalling both MeGUI and AviSynth to no avail. Of note everything still works on my laptop running XP, but its a lot slower for encoding.

Sorry if that was a bit long winded. Any help at all would be appreciated!

-mcg

[check]

where are you trying to load this video?

[Leak]

I'm using MeGUI 2.6.1012 and Avisynth 2.5.7 on Vista x64.
When I try to load a d2v file into Avisynth to create an Avisynth script it gives me this error (the last bit seems most important)
Ummm... exactly how are you trying to load that d2v file?

The correct way to do it would be with MPEG2Source("<path to your D2V file>") - are you perhaps trying to load it with Import("...")?

If that's not it, :script:

[Kurtnoise]

Since the file in question ISN'T an Avisynth script but a d2v I don't see why I'm getting this particular error.
http://forum.doom9.org/showthread.php?p=1046330#post1046330

[MrCommunistGen]

When I read that other thread I thought that my problem might be solved so I turned off "Open Preview after Avisynth script selection" but that didn't help. Just to clarify, I'm not trying to open an AviSynth script, I can't even generate one. I get the error when I try to load the d2v video input for the AviSynth script generator. Plus, if disabling the preview does what I think it does it would defeat the purpose because I need to apply cuts to the script and to do that I need the preview to find out where the cuts go.

Edit: I just tried loading the VOB file that the d2v points to and it let me generate an AviSynth script but I still can't use the AVS cutter. Also, the problem can't be my input file because I tried going back into one of my other projects that I had already started and it wouldn't let me use the AVS cutter when I previously had on that same file.

-mcg