When I try to export form entries to a CSV, the CSV is not generated and I'm given a blank white screen that only contains the number "1" (at URL .../wp-admin/admin.php?page=gf_export)
I'm running Wordpress 3.4.2 and have installed Gravity Forms 1.6.7. My website is hosted at Dreamhost. Last week the CSV export worked fine for me, now it doesn't. I've deactivated all plugins, tried it with a default theme, and looked at my logs but found no clues. I've tried setting WP_DEBUG to true, but the logs don't show anything more, and the GF white screen still just says "1".
What should I try next? Please help!