ios - difference in app working between simulator and iphone/ipad -

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i building ios chatting app in obj c. user can post messages. there anomalies in working of app on iphone/ipad. works on simulator.

1) on iphone, when post message, though pop says messaged posted successfully, doesn't show on message screen. when delete message, though pop says message deleted successfully, still appears in messages screen. problem not there in simulator. 2) on ipad, when try add image message, crashes app. in ipad simulator, problem doesn't exist.

there no compilation warnings or errors. simulator working fine. features not working on real device.

any thought?


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