I have had that problem every now and then too, in several of the Calibre versions (since 0.6.4x): pdf's seemingly converting, but end up as one blank page. The conversion of the particular file to txt seem to work most of the time. I haven't looked into it more than noted that it does happen with pdf/epub sometimes, since I've been able to fix it via another format most of the time.
I'm on holiday now, so if I find the time, I might run Calibre in debug mode and post my "findings" for some of the programmers to have a look at.
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