Previews corrupt with Lightroom 2.3

I've just downloaded Lightroom 2.3, running on a Dell laptop with Vista 32bit. Created a new catalog and then imported a batch of Canon RAW files. All the images appear fine in the filmstrip but when I click on one and it starts to render the preview, I end up with a corrupt preview. Bottom half looks fine but top half looks like a solarised negative. I deleted the catalog, rebooted and re-imported but still the same result. To isolate it as a Lightroom problem I opened a catalog I created yesterday with Lightroom 2.2. Everything there appears to be fine. I'm tempted to delete some previews from that and let 2.3 build them from scratch but it's a job with a deadline so don't want to risk screwing anything up.
Has anyone else had this problem with 2.3? I've never had any problem with Lightroom before and have used it from 1.0 upwards and have always installed the updates when prompted.
Cheers
David

Hi Dorin. All the files are fine. After much messing about I've finally managed to import everything OK. Did two things different so not sure which has sorted the problem. The first was no to use the copyright preset I normally use. The second was to import the 300 or so photos in 3 batches. First batch was about 25 photos, second was about 50 and then the third was for the rest. All previews now fine but have no idea what's sorted it.

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Message was edited by: hitonme

When you compare the files on other computers and they are ok, are you reading them onto the second computer from the camera memory card in a card-reader or USB-cable attached to the camera, or from some other step further along in the transfer process, such as from one computer’s hard-drive to another?
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If you are reading them from the memory card again and they are ok on the second computer, then what happens if you copy the photos, again, onto the first computer? Do the same ones have the same faults in the same locations or are the faults different? If the latter, then something in the transfer process (USB drivers/cable) or the computer, itself (memory, hard-drive), is bad.
If you remove and re-import the files do they still have the same faults in the same locations? If you purge your camera-raw cache and re-develop do the same faults show up? If not then perhaps wherever your raw cache is, is corrupted.
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Hi Geoffbubbles,
if you see only 1 photo you did export only 1 photo in the catalog.
Make sure you select all (e.g. <ctrl> A or remove the tick from "export selected photos only" in the dialog box of export-as-catalog =>will pick the total folder).
What Dorin mentions are catalogs as transportation vehicles between the two LR computer catalogs.
Let's assume you start on your home-comp and transfer to the work-comp.
When you EXPORT you give a name "home-to-work" for the transport catalog. You decide if you include the pictures by ticking "exclude negative files".
You would do so only for the first time, when your work-comp would not yet have them.
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As would leaving off the tick for "include available previews", but then your receiving computer would have to render the previews itself - your choice where you spend the effort.
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1 wrapping folder with the name you specified as transportation catalog name (in the example above "home-to-work")
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On the receiving computer, when you IMPORT FROM CATALOG, you only select the *.lrcat-file.
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When you use Dorins smart collection "Touched today" the virtual copies should not show up upon re-export on the way "work-to-home", provided you have further tweaked the master versions only. Or they do because in the end you liked them better and continued tweaking on them.
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