I also encountered this problem. I have an iphone. You have to close off the app completely then reopen it and collect. It only lets me collect one reward at a time so i repeated closing the app over and over collecting one at a time. Hope this helps u out.
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You can try this http://ggnbb.glu.com/showthread.php?121838-Tap-Sports-Baseball-In-Game-Help-and-Contact to submit your problem.