Errors using Lightroom DNG Recover Edge plug-in

Question

I'm trying the new Adobe Labs' DNG Recover Edge plug-in with Lightroom 4.2, but I'm having troubles on Canon 5D Mark II and Mark III images.
The plug-in:
http://labs.adobe.com/downloads/lightroomplugins.html
http://labsdownload.adobe.com/pub/labs/lightroomplugins/lightroomplugins_dngre_docs.pdf
When I apply it to an uncropped image, I often get this error message: "An internal error has occurred. ?:0: attempt to compare nil with number" When I get this message, Also, after that, I have to cancel the process manually or else it apparently runs indefinitely with no result.
I got that error message all but one time that to use the plug-in on my first attempt to get this working.
One exception was when it appeared to work, creating a new DNG with the suffix "_full" on the filename. However, it only increased the DNG size by a vanishingly small amount. Lightroom still reports its size as the same, 5760x3840 pixels in the frame around the image in the Library and in the overlaid info text (hit "I" to reveal). The metadata panel shows the larger 5796x3870 size.
After that, the plug-in appeared to work, but it created an image that was labeled "2 of 2," with a dark frame around it in the Library module. However, I couldn't find 1 of 2.
Then I quit and restarted Lightroom, and both of the images appeared, grouped as a stacked image. Comparing the two images, though, there was no difference, though the metadata panel said the one with the recovered edges should have more pixels.
Anybody else seeing these errors? They seemed to be less of an issue after my restart of Lightroom but the plug-in still seems to be misbehaving in some ways.

Answer 1

Regarding the plug-in problems, I also haven't been able to reproduce it since the initial failure. This includes trying it with the initial images for which the plug-in didn't work; I suspect the problem wasn't with the specific images but with some other issue about Lightroom's state. Lightroom seemed to be working OK aside from the plug-in issue. I first used the plug-in immediately after installing it, with no Lightroom restart.
Regarding the cropping issue, it finally occurred to me that the "full" DNG created with the plug-in was cropped. So yes, once I reset the crop, I got the full 5796x3870 view. It was an expectations management issue for me -- I'd expected to see the full uncropped version as soon as I created the full DNG. This is an RTFM failing on my part, since the documentation (I now see) says, "This results in new DNG images (automatically imported) where clearing the crop will give you the full image area..." I'm sure you thought about this software behavior carefully (for example in situations where somebody had cropped and rotated an image already before creating the full DNG), but FWIW I expected to see the full view when I created the full DNG. (As an aside, at least to me, the phrase "a.k.a., active area, stage 3 image area" in the documentation doesn't help to explain anything.)
Regarding the user crop with the 5D3, yes, again a case of RTFM failure. You do need to change "add cropping info" to on.
Thanks for your responses.