I guess you are using Splunk JS Stack 1.4 from http://dev.splunk.com/view/SP-CAAAEWR. When using this 1.4 version I had the same issue with you.
When I change to Splunk JS Stack version 1.1 from http://dev.splunk.com/view/webframework-developapps/SP-CAAAESV, the issue is resolved.
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