Lightroom 5 issues in import.

Hey guys! LOVE Lightroom 5 (full version). Super quick and helpful!

I'm running into an issue on Importing photos from a CF card. It is taking an unusually long time to render previews from the card (much longer than with LR 4 last week). Also, I'll choose to import and copy the files... and half of the time it'll only import some of the photos and says something like it could not copy all because not all the files were readable. So I eject the card and try again, then it's fine. This has happened several times. Any advice?
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