DotNetNuke and Firefox 4 - Problem with LinkClick.aspx

We have our company website deployed on DotNetNuke 5.04. The document management system uses LinkClick.aspx as a file processor to serve files. We have noticed lately that if you use Firefox 4 or the default browser on the Android OS, clicking on a link that uses the DMS does not download or display the file, it just shows a blank page. Example:

This only happens in these two browsers, as far as we can tell. It also does not seem to happen with other sites using DNN. Our Documents module was customized but I don't believe the customizations deal with the file processor. Please help as this is a major problem for us, especially on the mobile side.
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please post this issue in the DotNetNuke forums, and in the bug tracking system (

btw, you can test yourself whether this issue is caused by your modified code or not by using a different module, for instance the Announcements module, which also uses the DotNetNuke file handler.

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