I've deactivated all plugins except GF and tried the 20-11 theme, but regardless what I do, the downloaded .csv file is blank and 0 bytes in size. That said, having searched the forums, it looks like you guys might have a patch that fixes this. If that's so, can you send me a copy (I've got a dev license)?
I'm using wp 3.5.1, and the latest version of the plugin, on a win7 platform in Chrome.