Strange, red, pixelated images

Hi,
I recently purchased Lightroom 5 and I've been really enjoying it so far.
One issue I've found however is that occasionally Lightroom creates a weird, red pixelated effect on edited images in library module. I've posted a develop view, and library (loupe) view example below. It tends to occur on under exposed images that I've used noise reduction on. Sometimes, this persists in develop module too.
Develop module: http://i.imgur.com/G7hROKv.jpg
Library module: http://i.imgur.com/nSmp72T.png
Any ideas about what is causing this or how to fix it?
FYI, it exports fine.
Thanks!
M

Frank,
Actually, they were all similar enough to be able to crop, lift and stamp, so the viewable versions are all in working order. Problem solved. At this point, I'm just seeing if there are any other answers as far as fixing the Masters? I do not have any known backups of the originals before they were corrupted. The only thing that comes to my mind is to export all of the cropped versions and then to reimport them as Masters, but I really don't know what I would be doing. I mean, I know how to do that, but don't know if doing it somehow diminishes the image quality. The strange thing is, when I export the version, it is almost 4 times the size in MB of the Master (after exporting the Master). I don't fully understand image size as it relates to image quality, but I was always under the impression that the larger the file size, the more data stored and the higher the quality of the image. Therefore, a 5MB JPEG is of higher quality than a 2.3MB JPEG for example. Since the originals were JPEGS, I would assume that by exporting versions of the Master, I would be compressing an already compressed image? I don't really know, so I am not going to do anything about this unless someone can shed some clear light on what it all means, and what the ramifications of these types of actions would be.
Mac

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Strange, red, pixelated images

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