We just update to JIRA 5.2.6 build 849 with Minyaa 3.3.5 (Time management).
Everything, is ok except the Time Spent tab that throw error:

"An error occurred whilst rendering this message. Please contact the administrators, and inform them of this bug. Details: ------- org.apache.velocity.exception.MethodInvocationException: Invocation of method 'getReportElementKey' in class com.atlassian.jira.plugin.report.provider.ReportDefinition threw exception java.lang.NullPointerException at templates/reports/workload-issue.panel.vm[line 343, column 129] at org.apache.velocity.runtime.parser.node.ASTMethod.handleInvocationException"