unable-to-launch-your-application-for-one-user-only

collect below information first -

What OS is the user running?

What version of IE is she using?

What version of the Receiver ?

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1-) In IE > Tools > Internet Options > Advanced tab > tick SSL2.0

2-) Uninstall ICA client and reinstall.

3-) User's local profile on the PC rename and ask them to login.

4-) User's profile on Citrix Server rename and ask them to log back in.

5-) Test user on a different computer.

6-) Local firewall on the computer. Even if it's disabled - enable and then try.

7-) AV on the computer.

8-) User's profile on each of the Citrix Servers - delete them and make sure gone from registry if windows 2008 .bak key.

9-) On the trouble user's PC you login and try connecting to Citrix.

10-) Try using procmon.exe of the sysinternals suite to troubleshoot your problem. You can download it here:

http://technet.microsoft.com/en-us/sysinternals/bb896645.aspx

Logon to the server desktop and start procmon. Start the app under a normal user account (not admin) and see what happens. You might see one or more errors/access denieds etc. why the app. cannot start.