On my development server, when I click on a hyperlinked forms document, the eventual URL that opens has a few parameters added to the end of it, 'OpenIn' and 'Source'.

On my test server (deployed to with a site backup/restore) the same hyperlink on the same view results in a URL without the Source parameter.

I assume it is a configuration issue, but I can't think where it might be. Has anyone else come across this, or have a bright idea for me