Thanks for the reply. I'm glad to know I can rebuild my smart preview library and might end up doing that tonight. But, why would this happen all of a sudden? Is it possible to delete all your smart previews or to disassociate them with your library? When I look at my lightroom folder it looks like I have a 6.1 gig file that should contain my smart previews. Is it possible to relink that with my catalogue or do I need to start from scratch. Thanks!
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You can rename that existing folder by adding ".old" in the name and then rebuild the Smart Preview for all the Images.
When you rebuild the smart preview, it will give you the option to rebuild the Smart Preview for all the Images which would not take much efforts.once you finish doing it, you will see another folder for Smart Preview in the Lightroom folder.
Then you can delete the older folder with size of 6.1 GB to clear some space from the Hard drive.