Attachment box don't display at webtier

Hi Experts,

 

I need your help with the next issue:

 

If i want to attach a file at Webtier, in the section of attachments only displays the "Add File" button, but don't displays the attachment box. If i log in to another instance, it works. I think it's not the browser.

 

The webtier server of the issue has apache tomcat 7.0.46 and java 7. I don't have idea what could be.

 

Regards.

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