New Post: "upload multi file" works wrong

Build no. 4.0.4883.38746

i upload a zip file with some different pictures in it.
when upload finished ,i found that:
picture file count and picture file name are ok,
but some picture is the same image in fact !

and , if i upload multi zip files one by one continuous, then

FileNotFoundException:
未能找到文件“\App_Data\Composite\Cache\Temp\upload635042927071406250”。
Stack trace:
在 Composite.C1Console.Workflow.WorkflowFacadeImpl.RunWorkflow(Guid instanceId)
在 Composite.C1Console.Workflow.WorkflowFlowController.OnFinish(FlowToken flowToken, Dictionary2 bindings, FlowControllerServicesContainer serviceContainer)
在 Composite.Core.WebClient.FlowMediators.FormFlowRendering.FormFlowUiDefinitionRenderer.BaseEventHandler(String consoleId, String elementProviderName, FlowToken flowToken, FormFlowUiDefinition formFlowUiCommand, FlowControllerServicesContainer servicesContainer, Dictionary2 eventHandlers, IFormEventIdentifier localScopeEventIdentifier, FlowControllerServicesContainer formServicesContainer)
在 Composite.Core.WebClient.FlowMediators.FormFlowRendering.FormFlowUiDefinitionRenderer.<>c__DisplayClass3.<Render>b__0(Object sender, EventArgs e)
在 System.Web.UI.WebControls.LinkButton.OnClick(EventArgs e)
在 System.Web.UI.WebControls.LinkButton.
Generated 2013-05-16 17:18