What Group Policy setting would stop a Win 7 Program's URL links from opening?

I have a group of Windows 7 x64 computers managed by Group Policy. A program starts at log on for all users that contains URL links, the links are being blocked from opening by a Policy that is difficult to track down. I have checked File Associations, Internet Security Settings, Windows Explorer settings and none of those settings appear to be causing the problem. A Standard User and Administrator both start the program but both stop the links from opening the default web browser.

Any thoughts on what policy might block a Program URL link from opening in the default browser?
is-dtsAsked:
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FarWestCommented:
What message the browser gives when trying to open those URLs?
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is-dtsAuthor Commented:
With the Program open, I click the URL link, the blue circle appears for an instant but then disappears. No error message. I ran ProcMon while clicking the Link and can see some HKCU\Software\Classes\HTTP Registry keys being referenced with error "name not found" but nothing to suggest which Group Policy setting may be blocking the URL from opening the Default Browser.
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FarWestCommented:
is there any error messages when you type (or copy & paste) those links on IE?
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is-dtsAuthor Commented:
Right clicking on link has been blocked. Going straight to the URL in the browser loads OK
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FarWestCommented:
then I think it is your program issue, what is this program? is the problem with  all users?
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is-dtsAuthor Commented:
The Program is the PaperCut Client. Same client URL links worked on the previous image with the old GP settings, now with New image and new GP settings, client URL links are being blocked. Program URL links work on a different computer with less oppressive GP settings (staff computer). The computers in question are public facing so we lock them down pretty good, seems I've locked them down too well for this program.
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is-dtsAuthor Commented:
I found the solution. In the Group Policy Computer Configuration I had set:
Policies | Administrative Templates | Windows Components | Internet Explorer | Internet Settings | Set How Links are opened in Internet Explorer.
I had this enabled and set to Always open in Internet Explorer. Which basically killed hyperlinks in our Papercut Application. Turning this off allowed the Hyperlinks in the program to work OK.
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is-dtsAuthor Commented:
The reason is I tested the result by turning it back on and updating group policy and it killed the hyperlinks again. Turning off allowed the hyperlinks to work.
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