Transferred files by USB disk and drive - missing!

I try to transfer files by USB stick, and I suspect that an issue/bug may be happening:
1. I load, say, 100mb of files - maybe media files - onto a reliable SanDisk USB stick.
2. Then, I take the same files, and transfer them them on my hard drive. Predictable and easy, right?
3. One of two things happen. Either I get a named folder but with no files inside; or if I try to transfer individual files, see them appear on my iMac as they're being transferred, they then disappear, and there's a file transfer "plunk" afterwards. But no files have been transferred.
This is kind of a serious problem. How can I transfer files and folders by USB disk again? Have other Lion users experienced this problem?
Is this a by-product of a Lion feature, or some kind of bug that can be fixed?

Thanks for your reply.
I've tried transferring between a MacBook Pro and iMac, using a SanDisk USB drive, and in both cases, the files disappear - though the folder itself is for some reason preserved. I don't use Windows.
The files are fully compatible with a Mac format, and I've often used them succesfully in the past - until Lion. Now, any files, or the data in folders, just disappear.
Other users must be experiencing the same thing....

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