I have experienced the same problem for the past 3 days, could anyone provide a solution? I have tried rebooting my playbook but no dice. There seems to be a bug with the search function in the playbook appworld, maybe something to do with the recent update to blackberry world? The appworld on my playbook also doesnt seem to update with the new games like pocket ninjas.
Go to the blackberry website and click appworld and click download today and when it comes up for it to download it will tell you to replace the other appworld