JIRA Macro refresh fails

My Confluence page does not display the current and correct status of a JIRA Query. We're using Confluence 5.2.3 and the latest Version of the JIRA Macro plugin, wich is 5.0.3 at the moment. About 4 hours after a change, the macro first returns an error, then after refreshing the page it is showing the right value for the moment, but the result is always cached and every update in JIRA leads to wrong results in Confluence.