I've just found several (but not all) of my forms, some of them created a year or two ago, are blank. When I go to "Edit Forms", they are listed with their titles, views, entries, and conversion. But editing them produces a blank template, and embedding them in a WordPress post or page shows "Oops! We could not locate your form." Trying to access their entries produces this error ad nauseum:
Warning: Invalid argument supplied for foreach() in /wp-content/plugins/gravityforms/forms_model.php on line 2266
WordPress 3.2.1, Gravity Forms 1.6.1, PHP 5.3.5.
Any idea what happened to my data, and if it can be retrieved?