OK, I found the problem. It's browser related. Actually it's a problem of an extension of firefox which makes hyper link from text. It makes link 'DLQ.com' from the dead letter queue name 'DLQ.com.xxx.xxx' and then caused the display problem. I can view the page correctly in IE. However, there is another strange problem. There are two queues named 'styles.site.css' and 'styles.type-settings.css' in admin UI which we definitely don't create or use. This is not a display problem as it also shows in IE and page source. I can delete/browse them normally though there is not any message in them. I checked the source of the page and there are 2 css files referenced and their name happen to be 'styles/site.css' and 'styles/type-settings.css'. I have no idea who can create the two queues and actually I have seen them several times.
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