I've also had files zeroed out on a few occasions. I run Dropbox over a wide variety of machines and while this is completely anecdotal, the zero update has alw

I've also had files zeroed out on a few occasions. I run Dropbox over a wide variety of machines and while this is completely anecdotal, the zero update has always come from one of my Ubuntu machines, which leads me to believe that this is specific to the Linux version of Dropbox. Also, I had several occurrences throughout 2011 but so far hadn't lost anything during 2012, so either something has been fixed or I've just been lucky. :) So, if you've noticed zero length files lately, can you check the timestamp on the last update? Is it recent or over a year ago? You can also go to that date in your event log in the Dropbox web UI and see what was happening around that time.