Strange thumbnail rendering on import

I have been importing pictures in batches of maybe a few dozen at a time today and have had no problems (LR 2.0, Win XP). In my last import of 33, some old pictures had shown up - with the keywords of the new import. I let the import complete, closed LR, and brought it back up. Wallah - the default library view of the last import seems correct with just the correct 33 images.
What did I likely do wrong? Should I now be suspect of the catalog (which I backup multiple times a day) or just chalk it up to a fluke of sorts? I've never seen something like this before. Thanks.
Dilip

Hmm, that does seem strange. So you're seeing old images already in your catalog in the import dialog screen's previews along with the new images you're importing from a card, or disk, and you're sure the "import source" location does not contain originals of these older images? Has this happened more than this one time?
Maybe someone else has experienced something similar, or has a better idea of what might have happened.
Sorry I don't have any other ideas (like if deleting your prefs or going to 2.1RC would help, or if it might be some kind of memory issue, but I don't know) - Good luck.

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Every other aspect of Lightroom performs just fine on my machine. But the library is so slow that it is unusable. Every time I touch the scroll bar I can see a somewhat darker preview of the thumbnails and then as soon as I stop scrolling, the CPU shoots up to 100% utilization and I watch as the thumbnails brighten and adjust one by one. 30 to 45 seconds later I can click on the thumbnails and navigate around just fine. Performance is great in fact until I touch the scroll bar again.
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So I spent all evening experimenting with different things in Lightroom to try and improve performance and found 1 solution that worked. Although I'm not sure why.
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The ONLY thing I could get to clear up the problem was to select the top level folder in my catalog, and export the entire catalog as a new catalog. For export I did NOT choose to export the image files or the previews since I only wanted to keep my database (image adjustments, keywords, etc).
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The only thing I can think of is that my original catalog must have either been corrupt or there may be some upper limit on how many previews Lightroom can handle gracefully? Since I had standard previews for my entire catalog before.
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Message was edited by: Edsel

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Strange thumbnail rendering on import

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