Happened to me as well. For a temp fix I deactivated the plugin, downloaded the previous version, 0.52, from the developers page of the plugin at https://www.ads-software.com/extend/plugins/widget-logic/developers/. I then overwrote the new plugin which is located in the wp-content/plugins/widget-logic/ directory with the previous plugin and then activated the plugin again. That fixes the immediate problem and I will wait until wiser heads than mine figure out the fix. Hope this helps.
