Lightroom 4.3 Exporting "Empty" JPGs

I have been having a problem exporting w/ Lightroom on a Mac. It seems that no matter what export settings I am using, Lightroom will only properly export a few images out of several. I don't get an error message in Lightroom, but when I try to open the file, it tells me: "The file '__' could not be opened because it is empty". I'm at a loss, and I have to get several files exported today.
Thanks!

I believe this has something to do with the use of Dropbox on your computer.
Try shutting down Dropbox and see if the export work. Or try exporting to a folder that is not monitored by DropBox.

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