Error displaying .png image inside the portlet

Hi all -
I am having an issue with the remote portlet displaying a certain image file, i.e. .png is not showed up inside the portlet. If someone had dealt with this issue and know a fix, please share that information. THX.
A simple test war was built and deployed to the WebLogic server with two embedded images, one GIF and another PNG, and in Webcenter ALUI 6.5 a remote portlet/webservice were created to display the image files. The portlet only shows the .gif image and not the .png image?? I am not sure what the issue is with the portlet??

I am faced with the exact same issue: .png is not showed up inside the portlet. Removing the prefix URL gateway for the portlet web service would work.
However, in my case, my system is sitting behind a gateway to ensure a secure connection. I can NOT remove the prefix URL gateway on my system. It appears the problem is, if the portlet web service is prefix with a URL gateway, the PNG fie is delivered to the browser with the wrong MIME-type ("text/html" instead of "image/png").
My web service is deployed on a WebLogic container. Is this a configuration issue in AquaLogic/WebCenter Interactions?
Any help would be greatly appreciated. Thanks!

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sorry for the late reply. Yes I have checked all and see everything is fine there. Still not sure what cause this.
I have now installed 11.1.1.4.0, which is working fine.
--VipC

Error displaying .png image inside the portlet

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