I released version 0.91 (aka. 0.90 or 0.9) on Sunday only to discover later that evening that the changes to prevent the widget messing up the main WP query weren’t actually working on a page with multiple posts. The query wasn’t correct and wasn’t pulling out the correct data resulting in the widget terminating before any content had been created.
This was fixed fairly quickly and version 0.92 has now been release. Unfortunately, the WordPress plugin directory appears to be broken as it’s unable to establish that 0.92 is the latest version and so, if you have ACFW and you want to upgrade to this latest version, you’ll have to do it manually I’m afraid as your blog won’t even tell you there has been an update.