Hi banana14
Welcome to BlackBerry Support Forums
If you are having issue after updating your app world to the latest version then you should try the available workaround for this issue i;e downgrade to version 4.0.0.55 , For that from your BlackBerry browser browse or click here http://mobileapps.blackberry.com/devicesoftware/entry.do?code=appworld3 to download version 4.0.0.55.
Also refer to this Knowledge Base Article :
KB29422 BlackBerry App World icon is missing after upgrading to BlackBerry App World 4.0.0.63 to 4.0.0.65
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