How to Fix - Citrix application link not working in Internet Explorer 9?

Citrix application link not working in Internet Explorer 9

I am currently logging on to a website which publishes Citrix thin applications (typically Word, Excel etc) using the launcher.aspx web call.
This in turn should download a launch.ica file which will then call the Citrix Online Plugin.
 
The problem I am having is that clicking on the Citrix thin app link (which includes onclick, onmousedown and target attributes) does not call the launcher.aspx and download the launch.ica file.
I can see that the onclick/onmousedown functions are working
as it appends the timestamp to the URL.
 
Right-clicking on the link and selecting to save the target or open in a new tab correctly downloads the launch.ica file.
 
I am using:
Internet Explorer 9 32-bit
Windows 7 SP1 32-bit
Citrix Online Plugin 12.3 32-bit
 
The computer is also locked down using GPOs, but even moving the website into the Trusted zone has made no difference.
 
I have confirmed with another user from a difference company that the link does work in Windows 7 and Internet Explorer 9 - however they are using Citrix Receiver 13 rather than Citrix Online Plugin 12.3.
 
Any help gratefully received.

Keys to the Problem Citrix application link not working in Internet Explorer 9

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Eventually I solved the problem.
We have ActiveX components disabled by default and enabled only if permitted.
 
1.
Ensure the site is added to the Trusted Zone section in the GPO.
This allows the launch.ica to be downloaded without prompting to enable ActiveX components.
2.
Add two CLSIDs for Citrix ActiveX components to the IE Add-On Management section in the GPO
   a.
Citrix.ICAClient 238F6F83-B8B4-11CF-8771-00A024541EE3
   b.
Microsoft Web Browser Shell.Explorer 8856F961-340A-11D0-A96B-00C04FD705A2
 
This was the most useful link I found on it:
http://helgeklein.com/blog/2011/08/locking-down-internet-explorer-8-with-group-policy/

1. Access the files on your computer via MY COMPUTER
2. Under the C: drive, access the WINDOWS folder
3. Select the SOFTWARE DISTRIBUTION folder, followed by the DOWNLOAD folder.
4. Delete any files within this download folder.
5. If you are unable to delete these files, open the command prompt (CMD) as the administrator, and type "net stop wuauserv" into the CMD prompt window. Press ENTER. This should allow you to delete the files from step 4.
6. Once the files are deleted, open and run the CMD as the administrator and type "wuauclt.exe /updatenow". Press ENTER.

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