Settings for good/successful MPEG-2 I-frame encode

I've been having problems with Lagarith throwing junk frames when trying to encode to an intermediary AVI; using Vista Business/Ultimate 64, DV sequence with mixed XDCAM EX and DVCAM footage and uncompressed AVI renders from AE. The bad frames happen randomly (though rather infrequently) and in any of the footage types, so it's hard to rule out any of them as the source of the problem. I'm just going to assume it's an issue between Lagarith and AME, and move on from there.
Since I have quite a few timelines I'm exporting, and I'm doing all my end-product encoding in Squeeze as well as other apps, I need a good intermediary. I remember some talk on the board of using an MPEG-2 I-frame only 4:2:2 encode for this purpose; however, a search is not giving me much joy. So far, I'm having some inconsistent output issues with this format. Can anyone offer some advice as to good setting to use for this purpose?
Thanks!

Yes, I'm running 1.3.19. I thought it was happening on just my primary editing workstation, until I ran 10 encodes on my laptop and got the same random issue. I'll have to post a frame to show you what I mean. If it was repeatable, I could try and diagnose the issue, but the garbage happens randomly.
I'm running the 64-bit version of the codec--at least I think I am. It seems to me that the installer copies the 64-bit version of the codec to the System32 folder, and the 32-bit version to the SysWOW64 folder. Also, if you right-click on the DLL and check the file properties, the version states as 1.3.18; the actual interface when you select Codec Settings in an app, however, shows 1.3.19. Very peculiar...
Note that this only seems to be happening when exporting a timeline through AME. I can encode to an AVI from AE, and haven't been able to reproduce the bug.
I'm trying to get some information together, and I'm going to try contacting the codec author. He seems very receptive to bug reports, based on the changelogs on the Lagarith website.

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