Thumbnails Not Appearing in Finder

I posted this in the Leopard forumn, but I haven't gotten any response. I hope someone here can help.
I am having a strange problem with image thumbnails not appearing in Finder. I am editing some very large TIF files on a Macbook that is running Lion. These images are edited on an external drive, and when I hook the drive up to my main iMac, which is running Leopard, the new images I have created in Lion do not have thumbnails. The only way that they will appear is if I open the images in Photoshop and just resave them on the machine running Leopard. This method poses a problem because each image takes about 5-8 minutes to open, and another 5-8 to save. I have hundreds of images and don't have the time to do that to each one.
Does anyone know what could be causing this problem?

I've tried repairing disk permissions, as well as deleting the finder plist file, and neither of those things work.

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9:58 PM Monday; May 20, 2013
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"Limit the Logs to the Bits above Binary Images."  No, Seriously

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Thumbnails Not Appearing in Finder

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