It appears something went wrong with the authentication process that verifies that you are subscribed to WineRatings+ on that device.
Clearing the app's cache or data may fix this problem. Try the following steps.
1. Press your device's Home button
2. Press your device's Menu button, then select "Settings" (or "System Settings")
3. Go to "Applications" (This may vary between devices and may also be called Apps, Application Info or Application Manager)
5. Press the "Clear Cache" and "Clear Data" buttons.
6. Restart the app. If you see the message asking you to subscribe, tap "Enable this Device" to restore the subscription.
After completing these steps, try using the app again to see if you can access Search and Picks.
that does not work, please let us know and provide the roughly the date and time you experienced this problem, so that our development team can investigate in more depth.